first commit

backend/.venv/lib/python3.12/site-packages/asyncpg/__init__.py

@@ -0,0 +1,24 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+from __future__ import annotations
+
+from .connection import connect, Connection  # NOQA
+from .exceptions import *  # NOQA
+from .pool import create_pool, Pool  # NOQA
+from .protocol import Record  # NOQA
+from .types import *  # NOQA
+
+
+from ._version import __version__  # NOQA
+
+from . import exceptions
+
+
+__all__: tuple[str, ...] = (
+    'connect', 'create_pool', 'Pool', 'Record', 'Connection'
+)
+__all__ += exceptions.__all__ # NOQA

backend/.venv/lib/python3.12/site-packages/asyncpg/_asyncio_compat.py

@@ -0,0 +1,94 @@
+# Backports from Python/Lib/asyncio for older Pythons
+#
+# Copyright (c) 2001-2023 Python Software Foundation; All Rights Reserved
+#
+# SPDX-License-Identifier: PSF-2.0
+
+from __future__ import annotations
+
+import asyncio
+import functools
+import sys
+import typing
+
+if typing.TYPE_CHECKING:
+    from . import compat
+
+if sys.version_info < (3, 11):
+    from async_timeout import timeout as timeout_ctx
+else:
+    from asyncio import timeout as timeout_ctx
+
+_T = typing.TypeVar('_T')
+
+
+async def wait_for(fut: compat.Awaitable[_T], timeout: float | None) -> _T:
+    """Wait for the single Future or coroutine to complete, with timeout.
+
+    Coroutine will be wrapped in Task.
+
+    Returns result of the Future or coroutine.  When a timeout occurs,
+    it cancels the task and raises TimeoutError.  To avoid the task
+    cancellation, wrap it in shield().
+
+    If the wait is cancelled, the task is also cancelled.
+
+    If the task supresses the cancellation and returns a value instead,
+    that value is returned.
+
+    This function is a coroutine.
+    """
+    # The special case for timeout <= 0 is for the following case:
+    #
+    # async def test_waitfor():
+    #     func_started = False
+    #
+    #     async def func():
+    #         nonlocal func_started
+    #         func_started = True
+    #
+    #     try:
+    #         await asyncio.wait_for(func(), 0)
+    #     except asyncio.TimeoutError:
+    #         assert not func_started
+    #     else:
+    #         assert False
+    #
+    # asyncio.run(test_waitfor())
+
+    if timeout is not None and timeout <= 0:
+        fut = asyncio.ensure_future(fut)
+
+        if fut.done():
+            return fut.result()
+
+        await _cancel_and_wait(fut)
+        try:
+            return fut.result()
+        except asyncio.CancelledError as exc:
+            raise TimeoutError from exc
+
+    async with timeout_ctx(timeout):
+        return await fut
+
+
+async def _cancel_and_wait(fut: asyncio.Future[_T]) -> None:
+    """Cancel the *fut* future or task and wait until it completes."""
+
+    loop = asyncio.get_running_loop()
+    waiter = loop.create_future()
+    cb = functools.partial(_release_waiter, waiter)
+    fut.add_done_callback(cb)
+
+    try:
+        fut.cancel()
+        # We cannot wait on *fut* directly to make
+        # sure _cancel_and_wait itself is reliably cancellable.
+        await waiter
+    finally:
+        fut.remove_done_callback(cb)
+
+
+def _release_waiter(waiter: asyncio.Future[typing.Any], *args: object) -> None:
+    if not waiter.done():
+        waiter.set_result(None)

backend/.venv/lib/python3.12/site-packages/asyncpg/_testbase/__init__.py

@@ -0,0 +1,543 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import asyncio
+import atexit
+import contextlib
+import functools
+import inspect
+import logging
+import os
+import re
+import textwrap
+import time
+import traceback
+import unittest
+
+
+import asyncpg
+from asyncpg import cluster as pg_cluster
+from asyncpg import connection as pg_connection
+from asyncpg import pool as pg_pool
+
+from . import fuzzer
+
+
+@contextlib.contextmanager
+def silence_asyncio_long_exec_warning():
+    def flt(log_record):
+        msg = log_record.getMessage()
+        return not msg.startswith('Executing ')
+
+    logger = logging.getLogger('asyncio')
+    logger.addFilter(flt)
+    try:
+        yield
+    finally:
+        logger.removeFilter(flt)
+
+
+def with_timeout(timeout):
+    def wrap(func):
+        func.__timeout__ = timeout
+        return func
+
+    return wrap
+
+
+class TestCaseMeta(type(unittest.TestCase)):
+    TEST_TIMEOUT = None
+
+    @staticmethod
+    def _iter_methods(bases, ns):
+        for base in bases:
+            for methname in dir(base):
+                if not methname.startswith('test_'):
+                    continue
+
+                meth = getattr(base, methname)
+                if not inspect.iscoroutinefunction(meth):
+                    continue
+
+                yield methname, meth
+
+        for methname, meth in ns.items():
+            if not methname.startswith('test_'):
+                continue
+
+            if not inspect.iscoroutinefunction(meth):
+                continue
+
+            yield methname, meth
+
+    def __new__(mcls, name, bases, ns):
+        for methname, meth in mcls._iter_methods(bases, ns):
+            @functools.wraps(meth)
+            def wrapper(self, *args, __meth__=meth, **kwargs):
+                coro = __meth__(self, *args, **kwargs)
+                timeout = getattr(__meth__, '__timeout__', mcls.TEST_TIMEOUT)
+                if timeout:
+                    coro = asyncio.wait_for(coro, timeout)
+                    try:
+                        self.loop.run_until_complete(coro)
+                    except asyncio.TimeoutError:
+                        raise self.failureException(
+                            'test timed out after {} seconds'.format(
+                                timeout)) from None
+                else:
+                    self.loop.run_until_complete(coro)
+            ns[methname] = wrapper
+
+        return super().__new__(mcls, name, bases, ns)
+
+
+class TestCase(unittest.TestCase, metaclass=TestCaseMeta):
+
+    @classmethod
+    def setUpClass(cls):
+        if os.environ.get('USE_UVLOOP'):
+            import uvloop
+            asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(None)
+        cls.loop = loop
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.loop.close()
+        asyncio.set_event_loop(None)
+
+    def setUp(self):
+        self.loop.set_exception_handler(self.loop_exception_handler)
+        self.__unhandled_exceptions = []
+
+    def tearDown(self):
+        excs = []
+        for exc in self.__unhandled_exceptions:
+            if isinstance(exc, ConnectionResetError):
+                texc = traceback.TracebackException.from_exception(
+                    exc, lookup_lines=False)
+                if texc.stack[-1].name == "_call_connection_lost":
+                    # On Windows calling socket.shutdown may raise
+                    # ConnectionResetError, which happens in the
+                    # finally block of _call_connection_lost.
+                    continue
+            excs.append(exc)
+
+        if excs:
+            formatted = []
+
+            for i, context in enumerate(excs):
+                formatted.append(self._format_loop_exception(context, i + 1))
+
+            self.fail(
+                'unexpected exceptions in asynchronous code:\n' +
+                '\n'.join(formatted))
+
+    @contextlib.contextmanager
+    def assertRunUnder(self, delta):
+        st = time.monotonic()
+        try:
+            yield
+        finally:
+            elapsed = time.monotonic() - st
+            if elapsed > delta:
+                raise AssertionError(
+                    'running block took {:0.3f}s which is longer '
+                    'than the expected maximum of {:0.3f}s'.format(
+                        elapsed, delta))
+
+    @contextlib.contextmanager
+    def assertLoopErrorHandlerCalled(self, msg_re: str):
+        contexts = []
+
+        def handler(loop, ctx):
+            contexts.append(ctx)
+
+        old_handler = self.loop.get_exception_handler()
+        self.loop.set_exception_handler(handler)
+        try:
+            yield
+
+            for ctx in contexts:
+                msg = ctx.get('message')
+                if msg and re.search(msg_re, msg):
+                    return
+
+            raise AssertionError(
+                'no message matching {!r} was logged with '
+                'loop.call_exception_handler()'.format(msg_re))
+
+        finally:
+            self.loop.set_exception_handler(old_handler)
+
+    def loop_exception_handler(self, loop, context):
+        self.__unhandled_exceptions.append(context)
+        loop.default_exception_handler(context)
+
+    def _format_loop_exception(self, context, n):
+        message = context.get('message', 'Unhandled exception in event loop')
+        exception = context.get('exception')
+        if exception is not None:
+            exc_info = (type(exception), exception, exception.__traceback__)
+        else:
+            exc_info = None
+
+        lines = []
+        for key in sorted(context):
+            if key in {'message', 'exception'}:
+                continue
+            value = context[key]
+            if key == 'source_traceback':
+                tb = ''.join(traceback.format_list(value))
+                value = 'Object created at (most recent call last):\n'
+                value += tb.rstrip()
+            else:
+                try:
+                    value = repr(value)
+                except Exception as ex:
+                    value = ('Exception in __repr__ {!r}; '
+                             'value type: {!r}'.format(ex, type(value)))
+            lines.append('[{}]: {}\n\n'.format(key, value))
+
+        if exc_info is not None:
+            lines.append('[exception]:\n')
+            formatted_exc = textwrap.indent(
+                ''.join(traceback.format_exception(*exc_info)), '  ')
+            lines.append(formatted_exc)
+
+        details = textwrap.indent(''.join(lines), '    ')
+        return '{:02d}. {}:\n{}\n'.format(n, message, details)
+
+
+_default_cluster = None
+
+
+def _init_cluster(ClusterCls, cluster_kwargs, initdb_options=None):
+    cluster = ClusterCls(**cluster_kwargs)
+    cluster.init(**(initdb_options or {}))
+    cluster.trust_local_connections()
+    atexit.register(_shutdown_cluster, cluster)
+    return cluster
+
+
+def _get_initdb_options(initdb_options=None):
+    if not initdb_options:
+        initdb_options = {}
+    else:
+        initdb_options = dict(initdb_options)
+
+    # Make the default superuser name stable.
+    if 'username' not in initdb_options:
+        initdb_options['username'] = 'postgres'
+
+    return initdb_options
+
+
+def _init_default_cluster(initdb_options=None):
+    global _default_cluster
+
+    if _default_cluster is None:
+        pg_host = os.environ.get('PGHOST')
+        if pg_host:
+            # Using existing cluster, assuming it is initialized and running
+            _default_cluster = pg_cluster.RunningCluster()
+        else:
+            _default_cluster = _init_cluster(
+                pg_cluster.TempCluster,
+                cluster_kwargs={
+                    "data_dir_suffix": ".apgtest",
+                },
+                initdb_options=_get_initdb_options(initdb_options),
+            )
+
+    return _default_cluster
+
+
+def _shutdown_cluster(cluster):
+    if cluster.get_status() == 'running':
+        cluster.stop()
+    if cluster.get_status() != 'not-initialized':
+        cluster.destroy()
+
+
+def create_pool(dsn=None, *,
+                min_size=10,
+                max_size=10,
+                max_queries=50000,
+                max_inactive_connection_lifetime=60.0,
+                connect=None,
+                setup=None,
+                init=None,
+                loop=None,
+                pool_class=pg_pool.Pool,
+                connection_class=pg_connection.Connection,
+                record_class=asyncpg.Record,
+                **connect_kwargs):
+    return pool_class(
+        dsn,
+        min_size=min_size,
+        max_size=max_size,
+        max_queries=max_queries,
+        loop=loop,
+        connect=connect,
+        setup=setup,
+        init=init,
+        max_inactive_connection_lifetime=max_inactive_connection_lifetime,
+        connection_class=connection_class,
+        record_class=record_class,
+        **connect_kwargs,
+    )
+
+
+class ClusterTestCase(TestCase):
+    @classmethod
+    def get_server_settings(cls):
+        settings = {
+            'log_connections': 'on'
+        }
+
+        if cls.cluster.get_pg_version() >= (11, 0):
+            # JITting messes up timing tests, and
+            # is not essential for testing.
+            settings['jit'] = 'off'
+
+        return settings
+
+    @classmethod
+    def new_cluster(cls, ClusterCls, *, cluster_kwargs={}, initdb_options={}):
+        cluster = _init_cluster(ClusterCls, cluster_kwargs,
+                                _get_initdb_options(initdb_options))
+        cls._clusters.append(cluster)
+        return cluster
+
+    @classmethod
+    def start_cluster(cls, cluster, *, server_settings={}):
+        cluster.start(port='dynamic', server_settings=server_settings)
+
+    @classmethod
+    def setup_cluster(cls):
+        cls.cluster = _init_default_cluster()
+
+        if cls.cluster.get_status() != 'running':
+            cls.cluster.start(
+                port='dynamic', server_settings=cls.get_server_settings())
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls._clusters = []
+        cls.setup_cluster()
+
+    @classmethod
+    def tearDownClass(cls):
+        super().tearDownClass()
+        for cluster in cls._clusters:
+            if cluster is not _default_cluster:
+                cluster.stop()
+                cluster.destroy()
+        cls._clusters = []
+
+    @classmethod
+    def get_connection_spec(cls, kwargs={}):
+        conn_spec = cls.cluster.get_connection_spec()
+        if kwargs.get('dsn'):
+            conn_spec.pop('host')
+        conn_spec.update(kwargs)
+        if not os.environ.get('PGHOST') and not kwargs.get('dsn'):
+            if 'database' not in conn_spec:
+                conn_spec['database'] = 'postgres'
+            if 'user' not in conn_spec:
+                conn_spec['user'] = 'postgres'
+        return conn_spec
+
+    @classmethod
+    def connect(cls, **kwargs):
+        conn_spec = cls.get_connection_spec(kwargs)
+        return pg_connection.connect(**conn_spec, loop=cls.loop)
+
+    def setUp(self):
+        super().setUp()
+        self._pools = []
+
+    def tearDown(self):
+        super().tearDown()
+        for pool in self._pools:
+            pool.terminate()
+        self._pools = []
+
+    def create_pool(self, pool_class=pg_pool.Pool,
+                    connection_class=pg_connection.Connection, **kwargs):
+        conn_spec = self.get_connection_spec(kwargs)
+        pool = create_pool(loop=self.loop, pool_class=pool_class,
+                           connection_class=connection_class, **conn_spec)
+        self._pools.append(pool)
+        return pool
+
+
+class ProxiedClusterTestCase(ClusterTestCase):
+    @classmethod
+    def get_server_settings(cls):
+        settings = dict(super().get_server_settings())
+        settings['listen_addresses'] = '127.0.0.1'
+        return settings
+
+    @classmethod
+    def get_proxy_settings(cls):
+        return {'fuzzing-mode': None}
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        conn_spec = cls.cluster.get_connection_spec()
+        host = conn_spec.get('host')
+        if not host:
+            host = '127.0.0.1'
+        elif host.startswith('/'):
+            host = '127.0.0.1'
+        cls.proxy = fuzzer.TCPFuzzingProxy(
+            backend_host=host,
+            backend_port=conn_spec['port'],
+        )
+        cls.proxy.start()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.proxy.stop()
+        super().tearDownClass()
+
+    @classmethod
+    def get_connection_spec(cls, kwargs):
+        conn_spec = super().get_connection_spec(kwargs)
+        conn_spec['host'] = cls.proxy.listening_addr
+        conn_spec['port'] = cls.proxy.listening_port
+        return conn_spec
+
+    def tearDown(self):
+        self.proxy.reset()
+        super().tearDown()
+
+
+def with_connection_options(**options):
+    if not options:
+        raise ValueError('no connection options were specified')
+
+    def wrap(func):
+        func.__connect_options__ = options
+        return func
+
+    return wrap
+
+
+class ConnectedTestCase(ClusterTestCase):
+
+    def setUp(self):
+        super().setUp()
+
+        # Extract options set up with `with_connection_options`.
+        test_func = getattr(self, self._testMethodName).__func__
+        opts = getattr(test_func, '__connect_options__', {})
+        self.con = self.loop.run_until_complete(self.connect(**opts))
+        self.server_version = self.con.get_server_version()
+
+    def tearDown(self):
+        try:
+            self.loop.run_until_complete(self.con.close())
+            self.con = None
+        finally:
+            super().tearDown()
+
+
+class HotStandbyTestCase(ClusterTestCase):
+
+    @classmethod
+    def setup_cluster(cls):
+        cls.master_cluster = cls.new_cluster(pg_cluster.TempCluster)
+        cls.start_cluster(
+            cls.master_cluster,
+            server_settings={
+                'max_wal_senders': 10,
+                'wal_level': 'hot_standby'
+            }
+        )
+
+        con = None
+
+        try:
+            con = cls.loop.run_until_complete(
+                cls.master_cluster.connect(
+                    database='postgres', user='postgres', loop=cls.loop))
+
+            cls.loop.run_until_complete(
+                con.execute('''
+                    CREATE ROLE replication WITH LOGIN REPLICATION
+                '''))
+
+            cls.master_cluster.trust_local_replication_by('replication')
+
+            conn_spec = cls.master_cluster.get_connection_spec()
+
+            cls.standby_cluster = cls.new_cluster(
+                pg_cluster.HotStandbyCluster,
+                cluster_kwargs={
+                    'master': conn_spec,
+                    'replication_user': 'replication'
+                }
+            )
+            cls.start_cluster(
+                cls.standby_cluster,
+                server_settings={
+                    'hot_standby': True
+                }
+            )
+
+        finally:
+            if con is not None:
+                cls.loop.run_until_complete(con.close())
+
+    @classmethod
+    def get_cluster_connection_spec(cls, cluster, kwargs={}):
+        conn_spec = cluster.get_connection_spec()
+        if kwargs.get('dsn'):
+            conn_spec.pop('host')
+        conn_spec.update(kwargs)
+        if not os.environ.get('PGHOST') and not kwargs.get('dsn'):
+            if 'database' not in conn_spec:
+                conn_spec['database'] = 'postgres'
+            if 'user' not in conn_spec:
+                conn_spec['user'] = 'postgres'
+        return conn_spec
+
+    @classmethod
+    def get_connection_spec(cls, kwargs={}):
+        primary_spec = cls.get_cluster_connection_spec(
+            cls.master_cluster, kwargs
+        )
+        standby_spec = cls.get_cluster_connection_spec(
+            cls.standby_cluster, kwargs
+        )
+        return {
+            'host': [primary_spec['host'], standby_spec['host']],
+            'port': [primary_spec['port'], standby_spec['port']],
+            'database': primary_spec['database'],
+            'user': primary_spec['user'],
+            **kwargs
+        }
+
+    @classmethod
+    def connect_primary(cls, **kwargs):
+        conn_spec = cls.get_cluster_connection_spec(cls.master_cluster, kwargs)
+        return pg_connection.connect(**conn_spec, loop=cls.loop)
+
+    @classmethod
+    def connect_standby(cls, **kwargs):
+        conn_spec = cls.get_cluster_connection_spec(
+            cls.standby_cluster,
+            kwargs
+        )
+        return pg_connection.connect(**conn_spec, loop=cls.loop)

backend/.venv/lib/python3.12/site-packages/asyncpg/_testbase/fuzzer.py

@@ -0,0 +1,306 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import asyncio
+import socket
+import threading
+import typing
+
+from asyncpg import cluster
+
+
+class StopServer(Exception):
+    pass
+
+
+class TCPFuzzingProxy:
+    def __init__(self, *, listening_addr: str='127.0.0.1',
+                 listening_port: typing.Optional[int]=None,
+                 backend_host: str, backend_port: int,
+                 settings: typing.Optional[dict]=None) -> None:
+        self.listening_addr = listening_addr
+        self.listening_port = listening_port
+        self.backend_host = backend_host
+        self.backend_port = backend_port
+        self.settings = settings or {}
+        self.loop = None
+        self.connectivity = None
+        self.connectivity_loss = None
+        self.stop_event = None
+        self.connections = {}
+        self.sock = None
+        self.listen_task = None
+
+    async def _wait(self, work):
+        work_task = asyncio.ensure_future(work)
+        stop_event_task = asyncio.ensure_future(self.stop_event.wait())
+
+        try:
+            await asyncio.wait(
+                [work_task, stop_event_task],
+                return_when=asyncio.FIRST_COMPLETED)
+
+            if self.stop_event.is_set():
+                raise StopServer()
+            else:
+                return work_task.result()
+        finally:
+            if not work_task.done():
+                work_task.cancel()
+            if not stop_event_task.done():
+                stop_event_task.cancel()
+
+    def start(self):
+        started = threading.Event()
+        self.thread = threading.Thread(
+            target=self._start_thread, args=(started,))
+        self.thread.start()
+        if not started.wait(timeout=2):
+            raise RuntimeError('fuzzer proxy failed to start')
+
+    def stop(self):
+        self.loop.call_soon_threadsafe(self._stop)
+        self.thread.join()
+
+    def _stop(self):
+        self.stop_event.set()
+
+    def _start_thread(self, started_event):
+        self.loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(self.loop)
+
+        self.connectivity = asyncio.Event()
+        self.connectivity.set()
+        self.connectivity_loss = asyncio.Event()
+        self.stop_event = asyncio.Event()
+
+        if self.listening_port is None:
+            self.listening_port = cluster.find_available_port()
+
+        self.sock = socket.socket()
+        self.sock.bind((self.listening_addr, self.listening_port))
+        self.sock.listen(50)
+        self.sock.setblocking(False)
+
+        try:
+            self.loop.run_until_complete(self._main(started_event))
+        finally:
+            self.loop.close()
+
+    async def _main(self, started_event):
+        self.listen_task = asyncio.ensure_future(self.listen())
+        # Notify the main thread that we are ready to go.
+        started_event.set()
+        try:
+            await self.listen_task
+        finally:
+            for c in list(self.connections):
+                c.close()
+            await asyncio.sleep(0.01)
+            if hasattr(self.loop, 'remove_reader'):
+                self.loop.remove_reader(self.sock.fileno())
+            self.sock.close()
+
+    async def listen(self):
+        while True:
+            try:
+                client_sock, _ = await self._wait(
+                    self.loop.sock_accept(self.sock))
+
+                backend_sock = socket.socket()
+                backend_sock.setblocking(False)
+
+                await self._wait(self.loop.sock_connect(
+                    backend_sock, (self.backend_host, self.backend_port)))
+            except StopServer:
+                break
+
+            conn = Connection(client_sock, backend_sock, self)
+            conn_task = self.loop.create_task(conn.handle())
+            self.connections[conn] = conn_task
+
+    def trigger_connectivity_loss(self):
+        self.loop.call_soon_threadsafe(self._trigger_connectivity_loss)
+
+    def _trigger_connectivity_loss(self):
+        self.connectivity.clear()
+        self.connectivity_loss.set()
+
+    def restore_connectivity(self):
+        self.loop.call_soon_threadsafe(self._restore_connectivity)
+
+    def _restore_connectivity(self):
+        self.connectivity.set()
+        self.connectivity_loss.clear()
+
+    def reset(self):
+        self.restore_connectivity()
+
+    def _close_connection(self, connection):
+        conn_task = self.connections.pop(connection, None)
+        if conn_task is not None:
+            conn_task.cancel()
+
+    def close_all_connections(self):
+        for conn in list(self.connections):
+            self.loop.call_soon_threadsafe(self._close_connection, conn)
+
+
+class Connection:
+    def __init__(self, client_sock, backend_sock, proxy):
+        self.client_sock = client_sock
+        self.backend_sock = backend_sock
+        self.proxy = proxy
+        self.loop = proxy.loop
+        self.connectivity = proxy.connectivity
+        self.connectivity_loss = proxy.connectivity_loss
+        self.proxy_to_backend_task = None
+        self.proxy_from_backend_task = None
+        self.is_closed = False
+
+    def close(self):
+        if self.is_closed:
+            return
+
+        self.is_closed = True
+
+        if self.proxy_to_backend_task is not None:
+            self.proxy_to_backend_task.cancel()
+            self.proxy_to_backend_task = None
+
+        if self.proxy_from_backend_task is not None:
+            self.proxy_from_backend_task.cancel()
+            self.proxy_from_backend_task = None
+
+        self.proxy._close_connection(self)
+
+    async def handle(self):
+        self.proxy_to_backend_task = asyncio.ensure_future(
+            self.proxy_to_backend())
+
+        self.proxy_from_backend_task = asyncio.ensure_future(
+            self.proxy_from_backend())
+
+        try:
+            await asyncio.wait(
+                [self.proxy_to_backend_task, self.proxy_from_backend_task],
+                return_when=asyncio.FIRST_COMPLETED)
+
+        finally:
+            if self.proxy_to_backend_task is not None:
+                self.proxy_to_backend_task.cancel()
+
+            if self.proxy_from_backend_task is not None:
+                self.proxy_from_backend_task.cancel()
+
+            # Asyncio fails to properly remove the readers and writers
+            # when the task doing recv() or send() is cancelled, so
+            # we must remove the readers and writers manually before
+            # closing the sockets.
+            self.loop.remove_reader(self.client_sock.fileno())
+            self.loop.remove_writer(self.client_sock.fileno())
+            self.loop.remove_reader(self.backend_sock.fileno())
+            self.loop.remove_writer(self.backend_sock.fileno())
+
+            self.client_sock.close()
+            self.backend_sock.close()
+
+    async def _read(self, sock, n):
+        read_task = asyncio.ensure_future(
+            self.loop.sock_recv(sock, n))
+        conn_event_task = asyncio.ensure_future(
+            self.connectivity_loss.wait())
+
+        try:
+            await asyncio.wait(
+                [read_task, conn_event_task],
+                return_when=asyncio.FIRST_COMPLETED)
+
+            if self.connectivity_loss.is_set():
+                return None
+            else:
+                return read_task.result()
+        finally:
+            if not self.loop.is_closed():
+                if not read_task.done():
+                    read_task.cancel()
+                if not conn_event_task.done():
+                    conn_event_task.cancel()
+
+    async def _write(self, sock, data):
+        write_task = asyncio.ensure_future(
+            self.loop.sock_sendall(sock, data))
+        conn_event_task = asyncio.ensure_future(
+            self.connectivity_loss.wait())
+
+        try:
+            await asyncio.wait(
+                [write_task, conn_event_task],
+                return_when=asyncio.FIRST_COMPLETED)
+
+            if self.connectivity_loss.is_set():
+                return None
+            else:
+                return write_task.result()
+        finally:
+            if not self.loop.is_closed():
+                if not write_task.done():
+                    write_task.cancel()
+                if not conn_event_task.done():
+                    conn_event_task.cancel()
+
+    async def proxy_to_backend(self):
+        buf = None
+
+        try:
+            while True:
+                await self.connectivity.wait()
+                if buf is not None:
+                    data = buf
+                    buf = None
+                else:
+                    data = await self._read(self.client_sock, 4096)
+                if data == b'':
+                    break
+                if self.connectivity_loss.is_set():
+                    if data:
+                        buf = data
+                    continue
+                await self._write(self.backend_sock, data)
+
+        except ConnectionError:
+            pass
+
+        finally:
+            if not self.loop.is_closed():
+                self.loop.call_soon(self.close)
+
+    async def proxy_from_backend(self):
+        buf = None
+
+        try:
+            while True:
+                await self.connectivity.wait()
+                if buf is not None:
+                    data = buf
+                    buf = None
+                else:
+                    data = await self._read(self.backend_sock, 4096)
+                if data == b'':
+                    break
+                if self.connectivity_loss.is_set():
+                    if data:
+                        buf = data
+                    continue
+                await self._write(self.client_sock, data)
+
+        except ConnectionError:
+            pass
+
+        finally:
+            if not self.loop.is_closed():
+                self.loop.call_soon(self.close)

backend/.venv/lib/python3.12/site-packages/asyncpg/_version.py

@@ -0,0 +1,17 @@
+# This file MUST NOT contain anything but the __version__ assignment.
+#
+# When making a release, change the value of __version__
+# to an appropriate value, and open a pull request against
+# the correct branch (master if making a new feature release).
+# The commit message MUST contain a properly formatted release
+# log, and the commit must be signed.
+#
+# The release automation will: build and test the packages for the
+# supported platforms, publish the packages on PyPI, merge the PR
+# to the target branch, create a Git tag pointing to the commit.
+
+from __future__ import annotations
+
+import typing
+
+__version__: typing.Final = '0.31.0'

backend/.venv/lib/python3.12/site-packages/asyncpg/cluster.py

@@ -0,0 +1,729 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import asyncio
+import os
+import os.path
+import platform
+import random
+import re
+import shutil
+import socket
+import string
+import subprocess
+import sys
+import tempfile
+import textwrap
+import time
+
+import asyncpg
+from asyncpg import serverversion
+
+
+_system = platform.uname().system
+
+if _system == 'Windows':
+    def platform_exe(name):
+        if name.endswith('.exe'):
+            return name
+        return name + '.exe'
+else:
+    def platform_exe(name):
+        return name
+
+
+def find_available_port():
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    try:
+        sock.bind(('127.0.0.1', 0))
+        return sock.getsockname()[1]
+    except Exception:
+        return None
+    finally:
+        sock.close()
+
+
+def _world_readable_mkdtemp(suffix=None, prefix=None, dir=None):
+    name = "".join(random.choices(string.ascii_lowercase, k=8))
+    if dir is None:
+        dir = tempfile.gettempdir()
+    if prefix is None:
+        prefix = tempfile.gettempprefix()
+    if suffix is None:
+        suffix = ""
+    fn = os.path.join(dir, prefix + name + suffix)
+    os.mkdir(fn, 0o755)
+    return fn
+
+
+def _mkdtemp(suffix=None, prefix=None, dir=None):
+    if _system == 'Windows' and os.environ.get("GITHUB_ACTIONS"):
+        # Due to mitigations introduced in python/cpython#118486
+        # when Python runs in a session created via an SSH connection
+        # tempfile.mkdtemp creates directories that are not accessible.
+        return _world_readable_mkdtemp(suffix, prefix, dir)
+    else:
+        return tempfile.mkdtemp(suffix, prefix, dir)
+
+
+class ClusterError(Exception):
+    pass
+
+
+class Cluster:
+    def __init__(self, data_dir, *, pg_config_path=None):
+        self._data_dir = data_dir
+        self._pg_config_path = pg_config_path
+        self._pg_bin_dir = (
+            os.environ.get('PGINSTALLATION')
+            or os.environ.get('PGBIN')
+        )
+        self._pg_ctl = None
+        self._daemon_pid = None
+        self._daemon_process = None
+        self._connection_addr = None
+        self._connection_spec_override = None
+
+    def get_pg_version(self):
+        return self._pg_version
+
+    def is_managed(self):
+        return True
+
+    def get_data_dir(self):
+        return self._data_dir
+
+    def get_status(self):
+        if self._pg_ctl is None:
+            self._init_env()
+
+        process = subprocess.run(
+            [self._pg_ctl, 'status', '-D', self._data_dir],
+            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        stdout, stderr = process.stdout, process.stderr
+
+        if (process.returncode == 4 or not os.path.exists(self._data_dir) or
+                not os.listdir(self._data_dir)):
+            return 'not-initialized'
+        elif process.returncode == 3:
+            return 'stopped'
+        elif process.returncode == 0:
+            r = re.match(r'.*PID\s?:\s+(\d+).*', stdout.decode())
+            if not r:
+                raise ClusterError(
+                    'could not parse pg_ctl status output: {}'.format(
+                        stdout.decode()))
+            self._daemon_pid = int(r.group(1))
+            return self._test_connection(timeout=0)
+        else:
+            raise ClusterError(
+                'pg_ctl status exited with status {:d}: {}'.format(
+                    process.returncode, stderr))
+
+    async def connect(self, loop=None, **kwargs):
+        conn_info = self.get_connection_spec()
+        conn_info.update(kwargs)
+        return await asyncpg.connect(loop=loop, **conn_info)
+
+    def init(self, **settings):
+        """Initialize cluster."""
+        if self.get_status() != 'not-initialized':
+            raise ClusterError(
+                'cluster in {!r} has already been initialized'.format(
+                    self._data_dir))
+
+        settings = dict(settings)
+        if 'encoding' not in settings:
+            settings['encoding'] = 'UTF-8'
+
+        if settings:
+            settings_args = ['--{}={}'.format(k, v)
+                             for k, v in settings.items()]
+            extra_args = ['-o'] + [' '.join(settings_args)]
+        else:
+            extra_args = []
+
+        os.makedirs(self._data_dir, exist_ok=True)
+        process = subprocess.run(
+            [self._pg_ctl, 'init', '-D', self._data_dir] + extra_args,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            cwd=self._data_dir,
+        )
+
+        output = process.stdout
+
+        if process.returncode != 0:
+            raise ClusterError(
+                'pg_ctl init exited with status {:d}:\n{}'.format(
+                    process.returncode, output.decode()))
+
+        return output.decode()
+
+    def start(self, wait=60, *, server_settings={}, **opts):
+        """Start the cluster."""
+        status = self.get_status()
+        if status == 'running':
+            return
+        elif status == 'not-initialized':
+            raise ClusterError(
+                'cluster in {!r} has not been initialized'.format(
+                    self._data_dir))
+
+        port = opts.pop('port', None)
+        if port == 'dynamic':
+            port = find_available_port()
+
+        extra_args = ['--{}={}'.format(k, v) for k, v in opts.items()]
+        extra_args.append('--port={}'.format(port))
+
+        sockdir = server_settings.get('unix_socket_directories')
+        if sockdir is None:
+            sockdir = server_settings.get('unix_socket_directory')
+        if sockdir is None and _system != 'Windows':
+            sockdir = tempfile.gettempdir()
+
+        ssl_key = server_settings.get('ssl_key_file')
+        if ssl_key:
+            # Make sure server certificate key file has correct permissions.
+            keyfile = os.path.join(self._data_dir, 'srvkey.pem')
+            shutil.copy(ssl_key, keyfile)
+            os.chmod(keyfile, 0o600)
+            server_settings = server_settings.copy()
+            server_settings['ssl_key_file'] = keyfile
+
+        if sockdir is not None:
+            if self._pg_version < (9, 3):
+                sockdir_opt = 'unix_socket_directory'
+            else:
+                sockdir_opt = 'unix_socket_directories'
+
+            server_settings[sockdir_opt] = sockdir
+
+        for k, v in server_settings.items():
+            extra_args.extend(['-c', '{}={}'.format(k, v)])
+
+        if _system == 'Windows':
+            # On Windows we have to use pg_ctl as direct execution
+            # of postgres daemon under an Administrative account
+            # is not permitted and there is no easy way to drop
+            # privileges.
+            if os.getenv('ASYNCPG_DEBUG_SERVER'):
+                stdout = sys.stdout
+                print(
+                    'asyncpg.cluster: Running',
+                    ' '.join([
+                        self._pg_ctl, 'start', '-D', self._data_dir,
+                        '-o', ' '.join(extra_args)
+                    ]),
+                    file=sys.stderr,
+                )
+            else:
+                stdout = subprocess.DEVNULL
+
+            process = subprocess.run(
+                [self._pg_ctl, 'start', '-D', self._data_dir,
+                 '-o', ' '.join(extra_args)],
+                stdout=stdout,
+                stderr=subprocess.STDOUT,
+                cwd=self._data_dir,
+            )
+
+            if process.returncode != 0:
+                if process.stderr:
+                    stderr = ':\n{}'.format(process.stderr.decode())
+                else:
+                    stderr = ''
+                raise ClusterError(
+                    'pg_ctl start exited with status {:d}{}'.format(
+                        process.returncode, stderr))
+        else:
+            if os.getenv('ASYNCPG_DEBUG_SERVER'):
+                stdout = sys.stdout
+            else:
+                stdout = subprocess.DEVNULL
+
+            self._daemon_process = \
+                subprocess.Popen(
+                    [self._postgres, '-D', self._data_dir, *extra_args],
+                    stdout=stdout,
+                    stderr=subprocess.STDOUT,
+                    cwd=self._data_dir,
+                )
+
+            self._daemon_pid = self._daemon_process.pid
+
+        self._test_connection(timeout=wait)
+
+    def reload(self):
+        """Reload server configuration."""
+        status = self.get_status()
+        if status != 'running':
+            raise ClusterError('cannot reload: cluster is not running')
+
+        process = subprocess.run(
+            [self._pg_ctl, 'reload', '-D', self._data_dir],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            cwd=self._data_dir,
+        )
+
+        stderr = process.stderr
+
+        if process.returncode != 0:
+            raise ClusterError(
+                'pg_ctl stop exited with status {:d}: {}'.format(
+                    process.returncode, stderr.decode()))
+
+    def stop(self, wait=60):
+        process = subprocess.run(
+            [self._pg_ctl, 'stop', '-D', self._data_dir, '-t', str(wait),
+             '-m', 'fast'],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            cwd=self._data_dir,
+        )
+
+        stderr = process.stderr
+
+        if process.returncode != 0:
+            raise ClusterError(
+                'pg_ctl stop exited with status {:d}: {}'.format(
+                    process.returncode, stderr.decode()))
+
+        if (self._daemon_process is not None and
+                self._daemon_process.returncode is None):
+            self._daemon_process.kill()
+
+    def destroy(self):
+        status = self.get_status()
+        if status == 'stopped' or status == 'not-initialized':
+            shutil.rmtree(self._data_dir)
+        else:
+            raise ClusterError('cannot destroy {} cluster'.format(status))
+
+    def _get_connection_spec(self):
+        if self._connection_addr is None:
+            self._connection_addr = self._connection_addr_from_pidfile()
+
+        if self._connection_addr is not None:
+            if self._connection_spec_override:
+                args = self._connection_addr.copy()
+                args.update(self._connection_spec_override)
+                return args
+            else:
+                return self._connection_addr
+
+    def get_connection_spec(self):
+        status = self.get_status()
+        if status != 'running':
+            raise ClusterError('cluster is not running')
+
+        return self._get_connection_spec()
+
+    def override_connection_spec(self, **kwargs):
+        self._connection_spec_override = kwargs
+
+    def reset_wal(self, *, oid=None, xid=None):
+        status = self.get_status()
+        if status == 'not-initialized':
+            raise ClusterError(
+                'cannot modify WAL status: cluster is not initialized')
+
+        if status == 'running':
+            raise ClusterError(
+                'cannot modify WAL status: cluster is running')
+
+        opts = []
+        if oid is not None:
+            opts.extend(['-o', str(oid)])
+        if xid is not None:
+            opts.extend(['-x', str(xid)])
+        if not opts:
+            return
+
+        opts.append(self._data_dir)
+
+        try:
+            reset_wal = self._find_pg_binary('pg_resetwal')
+        except ClusterError:
+            reset_wal = self._find_pg_binary('pg_resetxlog')
+
+        process = subprocess.run(
+            [reset_wal] + opts,
+            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+
+        stderr = process.stderr
+
+        if process.returncode != 0:
+            raise ClusterError(
+                'pg_resetwal exited with status {:d}: {}'.format(
+                    process.returncode, stderr.decode()))
+
+    def reset_hba(self):
+        """Remove all records from pg_hba.conf."""
+        status = self.get_status()
+        if status == 'not-initialized':
+            raise ClusterError(
+                'cannot modify HBA records: cluster is not initialized')
+
+        pg_hba = os.path.join(self._data_dir, 'pg_hba.conf')
+
+        try:
+            with open(pg_hba, 'w'):
+                pass
+        except IOError as e:
+            raise ClusterError(
+                'cannot modify HBA records: {}'.format(e)) from e
+
+    def add_hba_entry(self, *, type='host', database, user, address=None,
+                      auth_method, auth_options=None):
+        """Add a record to pg_hba.conf."""
+        status = self.get_status()
+        if status == 'not-initialized':
+            raise ClusterError(
+                'cannot modify HBA records: cluster is not initialized')
+
+        if type not in {'local', 'host', 'hostssl', 'hostnossl'}:
+            raise ValueError('invalid HBA record type: {!r}'.format(type))
+
+        pg_hba = os.path.join(self._data_dir, 'pg_hba.conf')
+
+        record = '{} {} {}'.format(type, database, user)
+
+        if type != 'local':
+            if address is None:
+                raise ValueError(
+                    '{!r} entry requires a valid address'.format(type))
+            else:
+                record += ' {}'.format(address)
+
+        record += ' {}'.format(auth_method)
+
+        if auth_options is not None:
+            record += ' ' + ' '.join(
+                '{}={}'.format(k, v) for k, v in auth_options)
+
+        try:
+            with open(pg_hba, 'a') as f:
+                print(record, file=f)
+        except IOError as e:
+            raise ClusterError(
+                'cannot modify HBA records: {}'.format(e)) from e
+
+    def trust_local_connections(self):
+        self.reset_hba()
+
+        if _system != 'Windows':
+            self.add_hba_entry(type='local', database='all',
+                               user='all', auth_method='trust')
+        self.add_hba_entry(type='host', address='127.0.0.1/32',
+                           database='all', user='all',
+                           auth_method='trust')
+        self.add_hba_entry(type='host', address='::1/128',
+                           database='all', user='all',
+                           auth_method='trust')
+        status = self.get_status()
+        if status == 'running':
+            self.reload()
+
+    def trust_local_replication_by(self, user):
+        if _system != 'Windows':
+            self.add_hba_entry(type='local', database='replication',
+                               user=user, auth_method='trust')
+        self.add_hba_entry(type='host', address='127.0.0.1/32',
+                           database='replication', user=user,
+                           auth_method='trust')
+        self.add_hba_entry(type='host', address='::1/128',
+                           database='replication', user=user,
+                           auth_method='trust')
+        status = self.get_status()
+        if status == 'running':
+            self.reload()
+
+    def _init_env(self):
+        if not self._pg_bin_dir:
+            pg_config = self._find_pg_config(self._pg_config_path)
+            pg_config_data = self._run_pg_config(pg_config)
+
+            self._pg_bin_dir = pg_config_data.get('bindir')
+            if not self._pg_bin_dir:
+                raise ClusterError(
+                    'pg_config output did not provide the BINDIR value')
+
+        self._pg_ctl = self._find_pg_binary('pg_ctl')
+        self._postgres = self._find_pg_binary('postgres')
+        self._pg_version = self._get_pg_version()
+
+    def _connection_addr_from_pidfile(self):
+        pidfile = os.path.join(self._data_dir, 'postmaster.pid')
+
+        try:
+            with open(pidfile, 'rt') as f:
+                piddata = f.read()
+        except FileNotFoundError:
+            return None
+
+        lines = piddata.splitlines()
+
+        if len(lines) < 6:
+            # A complete postgres pidfile is at least 6 lines
+            return None
+
+        pmpid = int(lines[0])
+        if self._daemon_pid and pmpid != self._daemon_pid:
+            # This might be an old pidfile left from previous postgres
+            # daemon run.
+            return None
+
+        portnum = lines[3]
+        sockdir = lines[4]
+        hostaddr = lines[5]
+
+        if sockdir:
+            if sockdir[0] != '/':
+                # Relative sockdir
+                sockdir = os.path.normpath(
+                    os.path.join(self._data_dir, sockdir))
+            host_str = sockdir
+        else:
+            host_str = hostaddr
+
+        if host_str == '*':
+            host_str = 'localhost'
+        elif host_str == '0.0.0.0':
+            host_str = '127.0.0.1'
+        elif host_str == '::':
+            host_str = '::1'
+
+        return {
+            'host': host_str,
+            'port': portnum
+        }
+
+    def _test_connection(self, timeout=60):
+        self._connection_addr = None
+
+        loop = asyncio.new_event_loop()
+
+        try:
+            for i in range(timeout):
+                if self._connection_addr is None:
+                    conn_spec = self._get_connection_spec()
+                    if conn_spec is None:
+                        time.sleep(1)
+                        continue
+
+                try:
+                    con = loop.run_until_complete(
+                        asyncpg.connect(database='postgres',
+                                        user='postgres',
+                                        timeout=5, loop=loop,
+                                        **self._connection_addr))
+                except (OSError, asyncio.TimeoutError,
+                        asyncpg.CannotConnectNowError,
+                        asyncpg.PostgresConnectionError):
+                    time.sleep(1)
+                    continue
+                except asyncpg.PostgresError:
+                    # Any other error other than ServerNotReadyError or
+                    # ConnectionError is interpreted to indicate the server is
+                    # up.
+                    break
+                else:
+                    loop.run_until_complete(con.close())
+                    break
+        finally:
+            loop.close()
+
+        return 'running'
+
+    def _run_pg_config(self, pg_config_path):
+        process = subprocess.run(
+            pg_config_path, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        stdout, stderr = process.stdout, process.stderr
+
+        if process.returncode != 0:
+            raise ClusterError('pg_config exited with status {:d}: {}'.format(
+                process.returncode, stderr))
+        else:
+            config = {}
+
+            for line in stdout.splitlines():
+                k, eq, v = line.decode('utf-8').partition('=')
+                if eq:
+                    config[k.strip().lower()] = v.strip()
+
+            return config
+
+    def _find_pg_config(self, pg_config_path):
+        if pg_config_path is None:
+            pg_install = (
+                os.environ.get('PGINSTALLATION')
+                or os.environ.get('PGBIN')
+            )
+            if pg_install:
+                pg_config_path = platform_exe(
+                    os.path.join(pg_install, 'pg_config'))
+            else:
+                pathenv = os.environ.get('PATH').split(os.pathsep)
+                for path in pathenv:
+                    pg_config_path = platform_exe(
+                        os.path.join(path, 'pg_config'))
+                    if os.path.exists(pg_config_path):
+                        break
+                else:
+                    pg_config_path = None
+
+        if not pg_config_path:
+            raise ClusterError('could not find pg_config executable')
+
+        if not os.path.isfile(pg_config_path):
+            raise ClusterError('{!r} is not an executable'.format(
+                pg_config_path))
+
+        return pg_config_path
+
+    def _find_pg_binary(self, binary):
+        bpath = platform_exe(os.path.join(self._pg_bin_dir, binary))
+
+        if not os.path.isfile(bpath):
+            raise ClusterError(
+                'could not find {} executable: '.format(binary) +
+                '{!r} does not exist or is not a file'.format(bpath))
+
+        return bpath
+
+    def _get_pg_version(self):
+        process = subprocess.run(
+            [self._postgres, '--version'],
+            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        stdout, stderr = process.stdout, process.stderr
+
+        if process.returncode != 0:
+            raise ClusterError(
+                'postgres --version exited with status {:d}: {}'.format(
+                    process.returncode, stderr))
+
+        version_string = stdout.decode('utf-8').strip(' \n')
+        prefix = 'postgres (PostgreSQL) '
+        if not version_string.startswith(prefix):
+            raise ClusterError(
+                'could not determine server version from {!r}'.format(
+                    version_string))
+        version_string = version_string[len(prefix):]
+
+        return serverversion.split_server_version_string(version_string)
+
+
+class TempCluster(Cluster):
+    def __init__(self, *,
+                 data_dir_suffix=None, data_dir_prefix=None,
+                 data_dir_parent=None, pg_config_path=None):
+        self._data_dir = _mkdtemp(suffix=data_dir_suffix,
+                                  prefix=data_dir_prefix,
+                                  dir=data_dir_parent)
+        super().__init__(self._data_dir, pg_config_path=pg_config_path)
+
+
+class HotStandbyCluster(TempCluster):
+    def __init__(self, *,
+                 master, replication_user,
+                 data_dir_suffix=None, data_dir_prefix=None,
+                 data_dir_parent=None, pg_config_path=None):
+        self._master = master
+        self._repl_user = replication_user
+        super().__init__(
+            data_dir_suffix=data_dir_suffix,
+            data_dir_prefix=data_dir_prefix,
+            data_dir_parent=data_dir_parent,
+            pg_config_path=pg_config_path)
+
+    def _init_env(self):
+        super()._init_env()
+        self._pg_basebackup = self._find_pg_binary('pg_basebackup')
+
+    def init(self, **settings):
+        """Initialize cluster."""
+        if self.get_status() != 'not-initialized':
+            raise ClusterError(
+                'cluster in {!r} has already been initialized'.format(
+                    self._data_dir))
+
+        process = subprocess.run(
+            [self._pg_basebackup, '-h', self._master['host'],
+             '-p', self._master['port'], '-D', self._data_dir,
+             '-U', self._repl_user],
+            stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+
+        output = process.stdout
+
+        if process.returncode != 0:
+            raise ClusterError(
+                'pg_basebackup init exited with status {:d}:\n{}'.format(
+                    process.returncode, output.decode()))
+
+        if self._pg_version < (12, 0):
+            with open(os.path.join(self._data_dir, 'recovery.conf'), 'w') as f:
+                f.write(textwrap.dedent("""\
+                    standby_mode = 'on'
+                    primary_conninfo = 'host={host} port={port} user={user}'
+                """.format(
+                    host=self._master['host'],
+                    port=self._master['port'],
+                    user=self._repl_user)))
+        else:
+            f = open(os.path.join(self._data_dir, 'standby.signal'), 'w')
+            f.close()
+
+        return output.decode()
+
+    def start(self, wait=60, *, server_settings={}, **opts):
+        if self._pg_version >= (12, 0):
+            server_settings = server_settings.copy()
+            server_settings['primary_conninfo'] = (
+                '"host={host} port={port} user={user}"'.format(
+                    host=self._master['host'],
+                    port=self._master['port'],
+                    user=self._repl_user,
+                )
+            )
+
+        super().start(wait=wait, server_settings=server_settings, **opts)
+
+
+class RunningCluster(Cluster):
+    def __init__(self, **kwargs):
+        self.conn_spec = kwargs
+
+    def is_managed(self):
+        return False
+
+    def get_connection_spec(self):
+        return dict(self.conn_spec)
+
+    def get_status(self):
+        return 'running'
+
+    def init(self, **settings):
+        pass
+
+    def start(self, wait=60, **settings):
+        pass
+
+    def stop(self, wait=60):
+        pass
+
+    def destroy(self):
+        pass
+
+    def reset_hba(self):
+        raise ClusterError('cannot modify HBA records of unmanaged cluster')
+
+    def add_hba_entry(self, *, type='host', database, user, address=None,
+                      auth_method, auth_options=None):
+        raise ClusterError('cannot modify HBA records of unmanaged cluster')

backend/.venv/lib/python3.12/site-packages/asyncpg/compat.py

@@ -0,0 +1,88 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+from __future__ import annotations
+
+import enum
+import pathlib
+import platform
+import typing
+import sys
+
+if typing.TYPE_CHECKING:
+    import asyncio
+
+SYSTEM: typing.Final = platform.uname().system
+
+
+if sys.platform == 'win32':
+    import ctypes.wintypes
+
+    CSIDL_APPDATA: typing.Final = 0x001a
+
+    def get_pg_home_directory() -> pathlib.Path | None:
+        # We cannot simply use expanduser() as that returns the user's
+        # home directory, whereas Postgres stores its config in
+        # %AppData% on Windows.
+        buf = ctypes.create_unicode_buffer(ctypes.wintypes.MAX_PATH)
+        r = ctypes.windll.shell32.SHGetFolderPathW(0, CSIDL_APPDATA, 0, 0, buf)
+        if r:
+            return None
+        else:
+            return pathlib.Path(buf.value) / 'postgresql'
+
+else:
+    def get_pg_home_directory() -> pathlib.Path | None:
+        try:
+            return pathlib.Path.home()
+        except (RuntimeError, KeyError):
+            return None
+
+
+async def wait_closed(stream: asyncio.StreamWriter) -> None:
+    # Not all asyncio versions have StreamWriter.wait_closed().
+    if hasattr(stream, 'wait_closed'):
+        try:
+            await stream.wait_closed()
+        except ConnectionResetError:
+            # On Windows wait_closed() sometimes propagates
+            # ConnectionResetError which is totally unnecessary.
+            pass
+
+
+if sys.version_info < (3, 12):
+    def markcoroutinefunction(c):  # type: ignore
+        pass
+else:
+    from inspect import markcoroutinefunction  # noqa: F401
+
+
+if sys.version_info < (3, 12):
+    from ._asyncio_compat import wait_for as wait_for  # noqa: F401
+else:
+    from asyncio import wait_for as wait_for  # noqa: F401
+
+
+if sys.version_info < (3, 11):
+    from ._asyncio_compat import timeout_ctx as timeout  # noqa: F401
+else:
+    from asyncio import timeout as timeout  # noqa: F401
+
+if sys.version_info < (3, 9):
+    from typing import (  # noqa: F401
+        Awaitable as Awaitable,
+    )
+else:
+    from collections.abc import (  # noqa: F401
+        Awaitable as Awaitable,
+    )
+
+if sys.version_info < (3, 11):
+    class StrEnum(str, enum.Enum):
+        __str__ = str.__str__
+        __repr__ = enum.Enum.__repr__
+else:
+    from enum import StrEnum as StrEnum  # noqa: F401

backend/.venv/lib/python3.12/site-packages/asyncpg/connresource.py

@@ -0,0 +1,44 @@
+
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import functools
+
+from . import exceptions
+
+
+def guarded(meth):
+    """A decorator to add a sanity check to ConnectionResource methods."""
+
+    @functools.wraps(meth)
+    def _check(self, *args, **kwargs):
+        self._check_conn_validity(meth.__name__)
+        return meth(self, *args, **kwargs)
+
+    return _check
+
+
+class ConnectionResource:
+    __slots__ = ('_connection', '_con_release_ctr')
+
+    def __init__(self, connection):
+        self._connection = connection
+        self._con_release_ctr = connection._pool_release_ctr
+
+    def _check_conn_validity(self, meth_name):
+        con_release_ctr = self._connection._pool_release_ctr
+        if con_release_ctr != self._con_release_ctr:
+            raise exceptions.InterfaceError(
+                'cannot call {}.{}(): '
+                'the underlying connection has been released back '
+                'to the pool'.format(self.__class__.__name__, meth_name))
+
+        if self._connection.is_closed():
+            raise exceptions.InterfaceError(
+                'cannot call {}.{}(): '
+                'the underlying connection is closed'.format(
+                    self.__class__.__name__, meth_name))

backend/.venv/lib/python3.12/site-packages/asyncpg/cursor.py

@@ -0,0 +1,323 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import collections
+
+from . import connresource
+from . import exceptions
+
+
+class CursorFactory(connresource.ConnectionResource):
+    """A cursor interface for the results of a query.
+
+    A cursor interface can be used to initiate efficient traversal of the
+    results of a large query.
+    """
+
+    __slots__ = (
+        '_state',
+        '_args',
+        '_prefetch',
+        '_query',
+        '_timeout',
+        '_record_class',
+    )
+
+    def __init__(
+        self,
+        connection,
+        query,
+        state,
+        args,
+        prefetch,
+        timeout,
+        record_class
+    ):
+        super().__init__(connection)
+        self._args = args
+        self._prefetch = prefetch
+        self._query = query
+        self._timeout = timeout
+        self._state = state
+        self._record_class = record_class
+        if state is not None:
+            state.attach()
+
+    @connresource.guarded
+    def __aiter__(self):
+        prefetch = 50 if self._prefetch is None else self._prefetch
+        return CursorIterator(
+            self._connection,
+            self._query,
+            self._state,
+            self._args,
+            self._record_class,
+            prefetch,
+            self._timeout,
+        )
+
+    @connresource.guarded
+    def __await__(self):
+        if self._prefetch is not None:
+            raise exceptions.InterfaceError(
+                'prefetch argument can only be specified for iterable cursor')
+        cursor = Cursor(
+            self._connection,
+            self._query,
+            self._state,
+            self._args,
+            self._record_class,
+        )
+        return cursor._init(self._timeout).__await__()
+
+    def __del__(self):
+        if self._state is not None:
+            self._state.detach()
+            self._connection._maybe_gc_stmt(self._state)
+
+
+class BaseCursor(connresource.ConnectionResource):
+
+    __slots__ = (
+        '_state',
+        '_args',
+        '_portal_name',
+        '_exhausted',
+        '_query',
+        '_record_class',
+    )
+
+    def __init__(self, connection, query, state, args, record_class):
+        super().__init__(connection)
+        self._args = args
+        self._state = state
+        if state is not None:
+            state.attach()
+        self._portal_name = None
+        self._exhausted = False
+        self._query = query
+        self._record_class = record_class
+
+    def _check_ready(self):
+        if self._state is None:
+            raise exceptions.InterfaceError(
+                'cursor: no associated prepared statement')
+
+        if self._state.closed:
+            raise exceptions.InterfaceError(
+                'cursor: the prepared statement is closed')
+
+        if not self._connection._top_xact:
+            raise exceptions.NoActiveSQLTransactionError(
+                'cursor cannot be created outside of a transaction')
+
+    async def _bind_exec(self, n, timeout):
+        self._check_ready()
+
+        if self._portal_name:
+            raise exceptions.InterfaceError(
+                'cursor already has an open portal')
+
+        con = self._connection
+        protocol = con._protocol
+
+        self._portal_name = con._get_unique_id('portal')
+        buffer, _, self._exhausted = await protocol.bind_execute(
+            self._state, self._args, self._portal_name, n, True, timeout)
+        return buffer
+
+    async def _bind(self, timeout):
+        self._check_ready()
+
+        if self._portal_name:
+            raise exceptions.InterfaceError(
+                'cursor already has an open portal')
+
+        con = self._connection
+        protocol = con._protocol
+
+        self._portal_name = con._get_unique_id('portal')
+        buffer = await protocol.bind(self._state, self._args,
+                                     self._portal_name,
+                                     timeout)
+        return buffer
+
+    async def _exec(self, n, timeout):
+        self._check_ready()
+
+        if not self._portal_name:
+            raise exceptions.InterfaceError(
+                'cursor does not have an open portal')
+
+        protocol = self._connection._protocol
+        buffer, _, self._exhausted = await protocol.execute(
+            self._state, self._portal_name, n, True, timeout)
+        return buffer
+
+    async def _close_portal(self, timeout):
+        self._check_ready()
+
+        if not self._portal_name:
+            raise exceptions.InterfaceError(
+                'cursor does not have an open portal')
+
+        protocol = self._connection._protocol
+        await protocol.close_portal(self._portal_name, timeout)
+        self._portal_name = None
+
+    def __repr__(self):
+        attrs = []
+        if self._exhausted:
+            attrs.append('exhausted')
+        attrs.append('')  # to separate from id
+
+        if self.__class__.__module__.startswith('asyncpg.'):
+            mod = 'asyncpg'
+        else:
+            mod = self.__class__.__module__
+
+        return '<{}.{} "{!s:.30}" {}{:#x}>'.format(
+            mod, self.__class__.__name__,
+            self._state.query,
+            ' '.join(attrs), id(self))
+
+    def __del__(self):
+        if self._state is not None:
+            self._state.detach()
+            self._connection._maybe_gc_stmt(self._state)
+
+
+class CursorIterator(BaseCursor):
+
+    __slots__ = ('_buffer', '_prefetch', '_timeout')
+
+    def __init__(
+        self,
+        connection,
+        query,
+        state,
+        args,
+        record_class,
+        prefetch,
+        timeout
+    ):
+        super().__init__(connection, query, state, args, record_class)
+
+        if prefetch <= 0:
+            raise exceptions.InterfaceError(
+                'prefetch argument must be greater than zero')
+
+        self._buffer = collections.deque()
+        self._prefetch = prefetch
+        self._timeout = timeout
+
+    @connresource.guarded
+    def __aiter__(self):
+        return self
+
+    @connresource.guarded
+    async def __anext__(self):
+        if self._state is None:
+            self._state = await self._connection._get_statement(
+                self._query,
+                self._timeout,
+                named=True,
+                record_class=self._record_class,
+            )
+            self._state.attach()
+
+        if not self._portal_name and not self._exhausted:
+            buffer = await self._bind_exec(self._prefetch, self._timeout)
+            self._buffer.extend(buffer)
+
+        if not self._buffer and not self._exhausted:
+            buffer = await self._exec(self._prefetch, self._timeout)
+            self._buffer.extend(buffer)
+
+        if self._portal_name and self._exhausted:
+            await self._close_portal(self._timeout)
+
+        if self._buffer:
+            return self._buffer.popleft()
+
+        raise StopAsyncIteration
+
+
+class Cursor(BaseCursor):
+    """An open *portal* into the results of a query."""
+
+    __slots__ = ()
+
+    async def _init(self, timeout):
+        if self._state is None:
+            self._state = await self._connection._get_statement(
+                self._query,
+                timeout,
+                named=True,
+                record_class=self._record_class,
+            )
+            self._state.attach()
+        self._check_ready()
+        await self._bind(timeout)
+        return self
+
+    @connresource.guarded
+    async def fetch(self, n, *, timeout=None):
+        r"""Return the next *n* rows as a list of :class:`Record` objects.
+
+        :param float timeout: Optional timeout value in seconds.
+
+        :return: A list of :class:`Record` instances.
+        """
+        self._check_ready()
+        if n <= 0:
+            raise exceptions.InterfaceError('n must be greater than zero')
+        if self._exhausted:
+            return []
+        recs = await self._exec(n, timeout)
+        if len(recs) < n:
+            self._exhausted = True
+        return recs
+
+    @connresource.guarded
+    async def fetchrow(self, *, timeout=None):
+        r"""Return the next row.
+
+        :param float timeout: Optional timeout value in seconds.
+
+        :return: A :class:`Record` instance.
+        """
+        self._check_ready()
+        if self._exhausted:
+            return None
+        recs = await self._exec(1, timeout)
+        if len(recs) < 1:
+            self._exhausted = True
+            return None
+        return recs[0]
+
+    @connresource.guarded
+    async def forward(self, n, *, timeout=None) -> int:
+        r"""Skip over the next *n* rows.
+
+        :param float timeout: Optional timeout value in seconds.
+
+        :return: A number of rows actually skipped over (<= *n*).
+        """
+        self._check_ready()
+        if n <= 0:
+            raise exceptions.InterfaceError('n must be greater than zero')
+
+        protocol = self._connection._protocol
+        status = await protocol.query('MOVE FORWARD {:d} {}'.format(
+            n, self._portal_name), timeout)
+
+        advanced = int(status.split()[1])
+        if advanced < n:
+            self._exhausted = True
+
+        return advanced

backend/.venv/lib/python3.12/site-packages/asyncpg/exceptions/_base.py

@@ -0,0 +1,299 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import asyncpg
+import sys
+import textwrap
+
+
+__all__ = ('PostgresError', 'FatalPostgresError', 'UnknownPostgresError',
+           'InterfaceError', 'InterfaceWarning', 'PostgresLogMessage',
+           'ClientConfigurationError',
+           'InternalClientError', 'OutdatedSchemaCacheError', 'ProtocolError',
+           'UnsupportedClientFeatureError', 'TargetServerAttributeNotMatched',
+           'UnsupportedServerFeatureError')
+
+
+def _is_asyncpg_class(cls):
+    modname = cls.__module__
+    return modname == 'asyncpg' or modname.startswith('asyncpg.')
+
+
+class PostgresMessageMeta(type):
+
+    _message_map = {}
+    _field_map = {
+        'S': 'severity',
+        'V': 'severity_en',
+        'C': 'sqlstate',
+        'M': 'message',
+        'D': 'detail',
+        'H': 'hint',
+        'P': 'position',
+        'p': 'internal_position',
+        'q': 'internal_query',
+        'W': 'context',
+        's': 'schema_name',
+        't': 'table_name',
+        'c': 'column_name',
+        'd': 'data_type_name',
+        'n': 'constraint_name',
+        'F': 'server_source_filename',
+        'L': 'server_source_line',
+        'R': 'server_source_function'
+    }
+
+    def __new__(mcls, name, bases, dct):
+        cls = super().__new__(mcls, name, bases, dct)
+        if cls.__module__ == mcls.__module__ and name == 'PostgresMessage':
+            for f in mcls._field_map.values():
+                setattr(cls, f, None)
+
+        if _is_asyncpg_class(cls):
+            mod = sys.modules[cls.__module__]
+            if hasattr(mod, name):
+                raise RuntimeError('exception class redefinition: {}'.format(
+                    name))
+
+        code = dct.get('sqlstate')
+        if code is not None:
+            existing = mcls._message_map.get(code)
+            if existing is not None:
+                raise TypeError('{} has duplicate SQLSTATE code, which is'
+                                'already defined by {}'.format(
+                                    name, existing.__name__))
+            mcls._message_map[code] = cls
+
+        return cls
+
+    @classmethod
+    def get_message_class_for_sqlstate(mcls, code):
+        return mcls._message_map.get(code, UnknownPostgresError)
+
+
+class PostgresMessage(metaclass=PostgresMessageMeta):
+
+    @classmethod
+    def _get_error_class(cls, fields):
+        sqlstate = fields.get('C')
+        return type(cls).get_message_class_for_sqlstate(sqlstate)
+
+    @classmethod
+    def _get_error_dict(cls, fields, query):
+        dct = {
+            'query': query
+        }
+
+        field_map = type(cls)._field_map
+        for k, v in fields.items():
+            field = field_map.get(k)
+            if field:
+                dct[field] = v
+
+        return dct
+
+    @classmethod
+    def _make_constructor(cls, fields, query=None):
+        dct = cls._get_error_dict(fields, query)
+
+        exccls = cls._get_error_class(fields)
+        message = dct.get('message', '')
+
+        # PostgreSQL will raise an exception when it detects
+        # that the result type of the query has changed from
+        # when the statement was prepared.
+        #
+        # The original error is somewhat cryptic and unspecific,
+        # so we raise a custom subclass that is easier to handle
+        # and identify.
+        #
+        # Note that we specifically do not rely on the error
+        # message, as it is localizable.
+        is_icse = (
+            exccls.__name__ == 'FeatureNotSupportedError' and
+            _is_asyncpg_class(exccls) and
+            dct.get('server_source_function') == 'RevalidateCachedQuery'
+        )
+
+        if is_icse:
+            exceptions = sys.modules[exccls.__module__]
+            exccls = exceptions.InvalidCachedStatementError
+            message = ('cached statement plan is invalid due to a database '
+                       'schema or configuration change')
+
+        is_prepared_stmt_error = (
+            exccls.__name__ in ('DuplicatePreparedStatementError',
+                                'InvalidSQLStatementNameError') and
+            _is_asyncpg_class(exccls)
+        )
+
+        if is_prepared_stmt_error:
+            hint = dct.get('hint', '')
+            hint += textwrap.dedent("""\
+
+                NOTE: pgbouncer with pool_mode set to "transaction" or
+                "statement" does not support prepared statements properly.
+                You have two options:
+
+                * if you are using pgbouncer for connection pooling to a
+                  single server, switch to the connection pool functionality
+                  provided by asyncpg, it is a much better option for this
+                  purpose;
+
+                * if you have no option of avoiding the use of pgbouncer,
+                  then you can set statement_cache_size to 0 when creating
+                  the asyncpg connection object.
+            """)
+
+            dct['hint'] = hint
+
+        return exccls, message, dct
+
+    def as_dict(self):
+        dct = {}
+        for f in type(self)._field_map.values():
+            val = getattr(self, f)
+            if val is not None:
+                dct[f] = val
+        return dct
+
+
+class PostgresError(PostgresMessage, Exception):
+    """Base class for all Postgres errors."""
+
+    def __str__(self):
+        msg = self.args[0]
+        if self.detail:
+            msg += '\nDETAIL:  {}'.format(self.detail)
+        if self.hint:
+            msg += '\nHINT:  {}'.format(self.hint)
+
+        return msg
+
+    @classmethod
+    def new(cls, fields, query=None):
+        exccls, message, dct = cls._make_constructor(fields, query)
+        ex = exccls(message)
+        ex.__dict__.update(dct)
+        return ex
+
+
+class FatalPostgresError(PostgresError):
+    """A fatal error that should result in server disconnection."""
+
+
+class UnknownPostgresError(FatalPostgresError):
+    """An error with an unknown SQLSTATE code."""
+
+
+class InterfaceMessage:
+    def __init__(self, *, detail=None, hint=None):
+        self.detail = detail
+        self.hint = hint
+
+    def __str__(self):
+        msg = self.args[0]
+        if self.detail:
+            msg += '\nDETAIL:  {}'.format(self.detail)
+        if self.hint:
+            msg += '\nHINT:  {}'.format(self.hint)
+
+        return msg
+
+
+class InterfaceError(InterfaceMessage, Exception):
+    """An error caused by improper use of asyncpg API."""
+
+    def __init__(self, msg, *, detail=None, hint=None):
+        InterfaceMessage.__init__(self, detail=detail, hint=hint)
+        Exception.__init__(self, msg)
+
+    def with_msg(self, msg):
+        return type(self)(
+            msg,
+            detail=self.detail,
+            hint=self.hint,
+        ).with_traceback(
+            self.__traceback__
+        )
+
+
+class ClientConfigurationError(InterfaceError, ValueError):
+    """An error caused by improper client configuration."""
+
+
+class DataError(InterfaceError, ValueError):
+    """An error caused by invalid query input."""
+
+
+class UnsupportedClientFeatureError(InterfaceError):
+    """Requested feature is unsupported by asyncpg."""
+
+
+class UnsupportedServerFeatureError(InterfaceError):
+    """Requested feature is unsupported by PostgreSQL server."""
+
+
+class InterfaceWarning(InterfaceMessage, UserWarning):
+    """A warning caused by an improper use of asyncpg API."""
+
+    def __init__(self, msg, *, detail=None, hint=None):
+        InterfaceMessage.__init__(self, detail=detail, hint=hint)
+        UserWarning.__init__(self, msg)
+
+
+class InternalClientError(Exception):
+    """All unexpected errors not classified otherwise."""
+
+
+class ProtocolError(InternalClientError):
+    """Unexpected condition in the handling of PostgreSQL protocol input."""
+
+
+class TargetServerAttributeNotMatched(InternalClientError):
+    """Could not find a host that satisfies the target attribute requirement"""
+
+
+class OutdatedSchemaCacheError(InternalClientError):
+    """A value decoding error caused by a schema change before row fetching."""
+
+    def __init__(self, msg, *, schema=None, data_type=None, position=None):
+        super().__init__(msg)
+        self.schema_name = schema
+        self.data_type_name = data_type
+        self.position = position
+
+
+class PostgresLogMessage(PostgresMessage):
+    """A base class for non-error server messages."""
+
+    def __str__(self):
+        return '{}: {}'.format(type(self).__name__, self.message)
+
+    def __setattr__(self, name, val):
+        raise TypeError('instances of {} are immutable'.format(
+            type(self).__name__))
+
+    @classmethod
+    def new(cls, fields, query=None):
+        exccls, message_text, dct = cls._make_constructor(fields, query)
+
+        if exccls is UnknownPostgresError:
+            exccls = PostgresLogMessage
+
+        if exccls is PostgresLogMessage:
+            severity = dct.get('severity_en') or dct.get('severity')
+            if severity and severity.upper() == 'WARNING':
+                exccls = asyncpg.PostgresWarning
+
+        if issubclass(exccls, (BaseException, Warning)):
+            msg = exccls(message_text)
+        else:
+            msg = exccls()
+
+        msg.__dict__.update(dct)
+        return msg

backend/.venv/lib/python3.12/site-packages/asyncpg/introspection.py

@@ -0,0 +1,296 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+from __future__ import annotations
+
+import typing
+from .protocol.protocol import _create_record  # type: ignore
+
+if typing.TYPE_CHECKING:
+    from . import protocol
+
+
+_TYPEINFO_13: typing.Final = '''\
+    (
+        SELECT
+            t.oid                           AS oid,
+            ns.nspname                      AS ns,
+            t.typname                       AS name,
+            t.typtype                       AS kind,
+            (CASE WHEN t.typtype = 'd' THEN
+                (WITH RECURSIVE typebases(oid, depth) AS (
+                    SELECT
+                        t2.typbasetype      AS oid,
+                        0                   AS depth
+                    FROM
+                        pg_type t2
+                    WHERE
+                        t2.oid = t.oid
+
+                    UNION ALL
+
+                    SELECT
+                        t2.typbasetype      AS oid,
+                        tb.depth + 1        AS depth
+                    FROM
+                        pg_type t2,
+                        typebases tb
+                    WHERE
+                       tb.oid = t2.oid
+                       AND t2.typbasetype != 0
+               ) SELECT oid FROM typebases ORDER BY depth DESC LIMIT 1)
+
+               ELSE NULL
+            END)                            AS basetype,
+            t.typelem                       AS elemtype,
+            elem_t.typdelim                 AS elemdelim,
+            range_t.rngsubtype              AS range_subtype,
+            (CASE WHEN t.typtype = 'c' THEN
+                (SELECT
+                    array_agg(ia.atttypid ORDER BY ia.attnum)
+                FROM
+                    pg_attribute ia
+                    INNER JOIN pg_class c
+                        ON (ia.attrelid = c.oid)
+                WHERE
+                    ia.attnum > 0 AND NOT ia.attisdropped
+                    AND c.reltype = t.oid)
+
+                ELSE NULL
+            END)                            AS attrtypoids,
+            (CASE WHEN t.typtype = 'c' THEN
+                (SELECT
+                    array_agg(ia.attname::text ORDER BY ia.attnum)
+                FROM
+                    pg_attribute ia
+                    INNER JOIN pg_class c
+                        ON (ia.attrelid = c.oid)
+                WHERE
+                    ia.attnum > 0 AND NOT ia.attisdropped
+                    AND c.reltype = t.oid)
+
+                ELSE NULL
+            END)                            AS attrnames
+        FROM
+            pg_catalog.pg_type AS t
+            INNER JOIN pg_catalog.pg_namespace ns ON (
+                ns.oid = t.typnamespace)
+            LEFT JOIN pg_type elem_t ON (
+                t.typlen = -1 AND
+                t.typelem != 0 AND
+                t.typelem = elem_t.oid
+            )
+            LEFT JOIN pg_range range_t ON (
+                t.oid = range_t.rngtypid
+            )
+    )
+'''
+
+
+INTRO_LOOKUP_TYPES_13 = '''\
+WITH RECURSIVE typeinfo_tree(
+    oid, ns, name, kind, basetype, elemtype, elemdelim,
+    range_subtype, attrtypoids, attrnames, depth)
+AS (
+    SELECT
+        ti.oid, ti.ns, ti.name, ti.kind, ti.basetype,
+        ti.elemtype, ti.elemdelim, ti.range_subtype,
+        ti.attrtypoids, ti.attrnames, 0
+    FROM
+        {typeinfo} AS ti
+    WHERE
+        ti.oid = any($1::oid[])
+
+    UNION ALL
+
+    SELECT
+        ti.oid, ti.ns, ti.name, ti.kind, ti.basetype,
+        ti.elemtype, ti.elemdelim, ti.range_subtype,
+        ti.attrtypoids, ti.attrnames, tt.depth + 1
+    FROM
+        {typeinfo} ti,
+        typeinfo_tree tt
+    WHERE
+        (tt.elemtype IS NOT NULL AND ti.oid = tt.elemtype)
+        OR (tt.attrtypoids IS NOT NULL AND ti.oid = any(tt.attrtypoids))
+        OR (tt.range_subtype IS NOT NULL AND ti.oid = tt.range_subtype)
+        OR (tt.basetype IS NOT NULL AND ti.oid = tt.basetype)
+)
+
+SELECT DISTINCT
+    *,
+    basetype::regtype::text AS basetype_name,
+    elemtype::regtype::text AS elemtype_name,
+    range_subtype::regtype::text AS range_subtype_name
+FROM
+    typeinfo_tree
+ORDER BY
+    depth DESC
+'''.format(typeinfo=_TYPEINFO_13)
+
+
+_TYPEINFO: typing.Final = '''\
+    (
+        SELECT
+            t.oid                           AS oid,
+            ns.nspname                      AS ns,
+            t.typname                       AS name,
+            t.typtype                       AS kind,
+            (CASE WHEN t.typtype = 'd' THEN
+                (WITH RECURSIVE typebases(oid, depth) AS (
+                    SELECT
+                        t2.typbasetype      AS oid,
+                        0                   AS depth
+                    FROM
+                        pg_type t2
+                    WHERE
+                        t2.oid = t.oid
+
+                    UNION ALL
+
+                    SELECT
+                        t2.typbasetype      AS oid,
+                        tb.depth + 1        AS depth
+                    FROM
+                        pg_type t2,
+                        typebases tb
+                    WHERE
+                       tb.oid = t2.oid
+                       AND t2.typbasetype != 0
+               ) SELECT oid FROM typebases ORDER BY depth DESC LIMIT 1)
+
+               ELSE NULL
+            END)                            AS basetype,
+            t.typelem                       AS elemtype,
+            elem_t.typdelim                 AS elemdelim,
+            COALESCE(
+                range_t.rngsubtype,
+                multirange_t.rngsubtype)    AS range_subtype,
+            (CASE WHEN t.typtype = 'c' THEN
+                (SELECT
+                    array_agg(ia.atttypid ORDER BY ia.attnum)
+                FROM
+                    pg_attribute ia
+                    INNER JOIN pg_class c
+                        ON (ia.attrelid = c.oid)
+                WHERE
+                    ia.attnum > 0 AND NOT ia.attisdropped
+                    AND c.reltype = t.oid)
+
+                ELSE NULL
+            END)                            AS attrtypoids,
+            (CASE WHEN t.typtype = 'c' THEN
+                (SELECT
+                    array_agg(ia.attname::text ORDER BY ia.attnum)
+                FROM
+                    pg_attribute ia
+                    INNER JOIN pg_class c
+                        ON (ia.attrelid = c.oid)
+                WHERE
+                    ia.attnum > 0 AND NOT ia.attisdropped
+                    AND c.reltype = t.oid)
+
+                ELSE NULL
+            END)                            AS attrnames
+        FROM
+            pg_catalog.pg_type AS t
+            INNER JOIN pg_catalog.pg_namespace ns ON (
+                ns.oid = t.typnamespace)
+            LEFT JOIN pg_type elem_t ON (
+                t.typlen = -1 AND
+                t.typelem != 0 AND
+                t.typelem = elem_t.oid
+            )
+            LEFT JOIN pg_range range_t ON (
+                t.oid = range_t.rngtypid
+            )
+            LEFT JOIN pg_range multirange_t ON (
+                t.oid = multirange_t.rngmultitypid
+            )
+    )
+'''
+
+
+INTRO_LOOKUP_TYPES = '''\
+WITH RECURSIVE typeinfo_tree(
+    oid, ns, name, kind, basetype, elemtype, elemdelim,
+    range_subtype, attrtypoids, attrnames, depth)
+AS (
+    SELECT
+        ti.oid, ti.ns, ti.name, ti.kind, ti.basetype,
+        ti.elemtype, ti.elemdelim, ti.range_subtype,
+        ti.attrtypoids, ti.attrnames, 0
+    FROM
+        {typeinfo} AS ti
+    WHERE
+        ti.oid = any($1::oid[])
+
+    UNION ALL
+
+    SELECT
+        ti.oid, ti.ns, ti.name, ti.kind, ti.basetype,
+        ti.elemtype, ti.elemdelim, ti.range_subtype,
+        ti.attrtypoids, ti.attrnames, tt.depth + 1
+    FROM
+        {typeinfo} ti,
+        typeinfo_tree tt
+    WHERE
+        (tt.elemtype IS NOT NULL AND ti.oid = tt.elemtype)
+        OR (tt.attrtypoids IS NOT NULL AND ti.oid = any(tt.attrtypoids))
+        OR (tt.range_subtype IS NOT NULL AND ti.oid = tt.range_subtype)
+        OR (tt.basetype IS NOT NULL AND ti.oid = tt.basetype)
+)
+
+SELECT DISTINCT
+    *,
+    basetype::regtype::text AS basetype_name,
+    elemtype::regtype::text AS elemtype_name,
+    range_subtype::regtype::text AS range_subtype_name
+FROM
+    typeinfo_tree
+ORDER BY
+    depth DESC
+'''.format(typeinfo=_TYPEINFO)
+
+
+TYPE_BY_NAME: typing.Final = '''\
+SELECT
+    t.oid,
+    t.typelem     AS elemtype,
+    t.typtype     AS kind
+FROM
+    pg_catalog.pg_type AS t
+    INNER JOIN pg_catalog.pg_namespace ns ON (ns.oid = t.typnamespace)
+WHERE
+    t.typname = $1 AND ns.nspname = $2
+'''
+
+
+def TypeRecord(
+    rec: typing.Tuple[int, typing.Optional[int], bytes],
+) -> protocol.Record:
+    assert len(rec) == 3
+    return _create_record(  # type: ignore
+        {"oid": 0, "elemtype": 1, "kind": 2}, rec)
+
+
+# 'b' for a base type, 'd' for a domain, 'e' for enum.
+SCALAR_TYPE_KINDS = (b'b', b'd', b'e')
+
+
+def is_scalar_type(typeinfo: protocol.Record) -> bool:
+    return (
+        typeinfo['kind'] in SCALAR_TYPE_KINDS and
+        not typeinfo['elemtype']
+    )
+
+
+def is_domain_type(typeinfo: protocol.Record) -> bool:
+    return typeinfo['kind'] == b'd'  # type: ignore[no-any-return]
+
+
+def is_composite_type(typeinfo: protocol.Record) -> bool:
+    return typeinfo['kind'] == b'c'  # type: ignore[no-any-return]

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/__init__.pxd

@@ -0,0 +1,5 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/__init__.py

@@ -0,0 +1,5 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/buffer.pxd

@@ -0,0 +1,143 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from libc.stdint cimport int8_t, uint8_t, int16_t, uint16_t, \
+                         int32_t, uint32_t, int64_t, uint64_t
+
+
+include "./buffer.pxi"
+
+
+cdef class WriteBuffer:
+    cdef:
+        # Preallocated small buffer
+        bint _smallbuf_inuse
+        char _smallbuf[_BUFFER_INITIAL_SIZE]
+
+        char *_buf
+
+        # Allocated size
+        ssize_t _size
+
+        # Length of data in the buffer
+        ssize_t _length
+
+        # Number of memoryviews attached to the buffer
+        int _view_count
+
+        # True is start_message was used
+        bint _message_mode
+
+    cdef inline len(self):
+        return self._length
+
+    cdef inline write_len_prefixed_utf8(self, str s):
+        return self.write_len_prefixed_bytes(s.encode('utf-8'))
+
+    cdef inline _check_readonly(self)
+    cdef inline _ensure_alloced(self, ssize_t extra_length)
+    cdef _reallocate(self, ssize_t new_size)
+    cdef inline reset(self)
+    cdef inline start_message(self, char type)
+    cdef inline end_message(self)
+    cdef write_buffer(self, WriteBuffer buf)
+    cdef write_byte(self, char b)
+    cdef write_bytes(self, bytes data)
+    cdef write_len_prefixed_buffer(self, WriteBuffer buf)
+    cdef write_len_prefixed_bytes(self, bytes data)
+    cdef write_bytestring(self, bytes string)
+    cdef write_str(self, str string, str encoding)
+    cdef write_frbuf(self, FRBuffer *buf)
+    cdef write_cstr(self, const char *data, ssize_t len)
+    cdef write_int16(self, int16_t i)
+    cdef write_int32(self, int32_t i)
+    cdef write_int64(self, int64_t i)
+    cdef write_float(self, float f)
+    cdef write_double(self, double d)
+
+    @staticmethod
+    cdef WriteBuffer new_message(char type)
+
+    @staticmethod
+    cdef WriteBuffer new()
+
+
+ctypedef const char * (*try_consume_message_method)(object, ssize_t*)
+ctypedef int32_t (*take_message_type_method)(object, char) except -1
+ctypedef int32_t (*take_message_method)(object) except -1
+ctypedef char (*get_message_type_method)(object)
+
+
+cdef class ReadBuffer:
+    cdef:
+        # A deque of buffers (bytes objects)
+        object _bufs
+        object _bufs_append
+        object _bufs_popleft
+
+        # A pointer to the first buffer in `_bufs`
+        bytes _buf0
+
+        # A pointer to the previous first buffer
+        # (used to prolong the life of _buf0 when using
+        # methods like _try_read_bytes)
+        bytes _buf0_prev
+
+        # Number of buffers in `_bufs`
+        int32_t _bufs_len
+
+        # A read position in the first buffer in `_bufs`
+        ssize_t _pos0
+
+        # Length of the first buffer in `_bufs`
+        ssize_t _len0
+
+        # A total number of buffered bytes in ReadBuffer
+        ssize_t _length
+
+        char _current_message_type
+        int32_t _current_message_len
+        ssize_t _current_message_len_unread
+        bint _current_message_ready
+
+    cdef inline len(self):
+        return self._length
+
+    cdef inline char get_message_type(self):
+        return self._current_message_type
+
+    cdef inline int32_t get_message_length(self):
+        return self._current_message_len
+
+    cdef feed_data(self, data)
+    cdef inline _ensure_first_buf(self)
+    cdef _switch_to_next_buf(self)
+    cdef inline char read_byte(self) except? -1
+    cdef inline const char* _try_read_bytes(self, ssize_t nbytes)
+    cdef inline _read_into(self, char *buf, ssize_t nbytes)
+    cdef inline _read_and_discard(self, ssize_t nbytes)
+    cdef bytes read_bytes(self, ssize_t nbytes)
+    cdef bytes read_len_prefixed_bytes(self)
+    cdef str read_len_prefixed_utf8(self)
+    cdef read_uuid(self)
+    cdef inline int64_t read_int64(self) except? -1
+    cdef inline int32_t read_int32(self) except? -1
+    cdef inline int16_t read_int16(self) except? -1
+    cdef inline read_null_str(self)
+    cdef int32_t take_message(self) except -1
+    cdef inline int32_t take_message_type(self, char mtype) except -1
+    cdef int32_t put_message(self) except -1
+    cdef inline const char* try_consume_message(self, ssize_t* len)
+    cdef bytes consume_message(self)
+    cdef discard_message(self)
+    cdef int32_t redirect_messages(self, WriteBuffer buf, char mtype, int stop_at=?)
+    cdef bytearray consume_messages(self, char mtype)
+    cdef finish_message(self)
+    cdef inline _finish_message(self)
+
+    @staticmethod
+    cdef ReadBuffer new_message_parser(object data)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/buffer.pxi

@@ -0,0 +1,3 @@
+DEF _BUFFER_INITIAL_SIZE = 1024
+DEF _BUFFER_MAX_GROW = 65536
+DEF _BUFFER_FREELIST_SIZE = 256

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/buffer.pyx

@@ -0,0 +1,829 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from libc.string cimport memcpy
+
+import collections
+
+class BufferError(Exception):
+    pass
+
+include "./buffer.pxi"
+
+@cython.no_gc_clear
+@cython.final
+@cython.freelist(_BUFFER_FREELIST_SIZE)
+cdef class WriteBuffer:
+
+    def __cinit__(self):
+        self._smallbuf_inuse = True
+        self._buf = self._smallbuf
+        self._size = _BUFFER_INITIAL_SIZE
+        self._length = 0
+        self._message_mode = 0
+
+    def __dealloc__(self):
+        if self._buf is not NULL and not self._smallbuf_inuse:
+            cpython.PyMem_Free(self._buf)
+            self._buf = NULL
+            self._size = 0
+
+        if self._view_count:
+            raise BufferError(
+                'Deallocating buffer with attached memoryviews')
+
+    def __getbuffer__(self, Py_buffer *buffer, int flags):
+        self._view_count += 1
+
+        cpython.PyBuffer_FillInfo(
+            buffer, self, self._buf, self._length,
+            1,  # read-only
+            flags)
+
+    def __releasebuffer__(self, Py_buffer *buffer):
+        self._view_count -= 1
+
+    cdef inline _check_readonly(self):
+        if self._view_count:
+            raise BufferError('the buffer is in read-only mode')
+
+    cdef inline _ensure_alloced(self, ssize_t extra_length):
+        cdef ssize_t new_size = extra_length + self._length
+
+        if new_size > self._size:
+            self._reallocate(new_size)
+
+    cdef _reallocate(self, ssize_t new_size):
+        cdef char *new_buf
+
+        if new_size < _BUFFER_MAX_GROW:
+            new_size = _BUFFER_MAX_GROW
+        else:
+            # Add a little extra
+            new_size += _BUFFER_INITIAL_SIZE
+
+        if self._smallbuf_inuse:
+            new_buf = <char*>cpython.PyMem_Malloc(
+                sizeof(char) * <size_t>new_size)
+            if new_buf is NULL:
+                self._buf = NULL
+                self._size = 0
+                self._length = 0
+                raise MemoryError
+            memcpy(new_buf, self._buf, <size_t>self._size)
+            self._size = new_size
+            self._buf = new_buf
+            self._smallbuf_inuse = False
+        else:
+            new_buf = <char*>cpython.PyMem_Realloc(
+                <void*>self._buf, <size_t>new_size)
+            if new_buf is NULL:
+                cpython.PyMem_Free(self._buf)
+                self._buf = NULL
+                self._size = 0
+                self._length = 0
+                raise MemoryError
+            self._buf = new_buf
+            self._size = new_size
+
+    cdef inline start_message(self, char type):
+        if self._length != 0:
+            raise BufferError(
+                'cannot start_message for a non-empty buffer')
+        self._ensure_alloced(5)
+        self._message_mode = 1
+        self._buf[0] = type
+        self._length = 5
+
+    cdef inline end_message(self):
+        # "length-1" to exclude the message type byte
+        cdef ssize_t mlen = self._length - 1
+
+        self._check_readonly()
+        if not self._message_mode:
+            raise BufferError(
+                'end_message can only be called with start_message')
+        if self._length < 5:
+            raise BufferError('end_message: buffer is too small')
+        if mlen > _MAXINT32:
+            raise BufferError('end_message: message is too large')
+
+        hton.pack_int32(&self._buf[1], <int32_t>mlen)
+        return self
+
+    cdef inline reset(self):
+        self._length = 0
+        self._message_mode = 0
+
+    cdef write_buffer(self, WriteBuffer buf):
+        self._check_readonly()
+
+        if not buf._length:
+            return
+
+        self._ensure_alloced(buf._length)
+        memcpy(self._buf + self._length,
+               <void*>buf._buf,
+               <size_t>buf._length)
+        self._length += buf._length
+
+    cdef write_byte(self, char b):
+        self._check_readonly()
+
+        self._ensure_alloced(1)
+        self._buf[self._length] = b
+        self._length += 1
+
+    cdef write_bytes(self, bytes data):
+        cdef char* buf
+        cdef ssize_t len
+
+        cpython.PyBytes_AsStringAndSize(data, &buf, &len)
+        self.write_cstr(buf, len)
+
+    cdef write_bytestring(self, bytes string):
+        cdef char* buf
+        cdef ssize_t len
+
+        cpython.PyBytes_AsStringAndSize(string, &buf, &len)
+        # PyBytes_AsStringAndSize returns a null-terminated buffer,
+        # but the null byte is not counted in len. hence the + 1
+        self.write_cstr(buf, len + 1)
+
+    cdef write_str(self, str string, str encoding):
+        self.write_bytestring(string.encode(encoding))
+
+    cdef write_len_prefixed_buffer(self, WriteBuffer buf):
+        # Write a length-prefixed (not NULL-terminated) bytes sequence.
+        self.write_int32(<int32_t>buf.len())
+        self.write_buffer(buf)
+
+    cdef write_len_prefixed_bytes(self, bytes data):
+        # Write a length-prefixed (not NULL-terminated) bytes sequence.
+        cdef:
+            char *buf
+            ssize_t size
+
+        cpython.PyBytes_AsStringAndSize(data, &buf, &size)
+        if size > _MAXINT32:
+            raise BufferError('string is too large')
+        # `size` does not account for the NULL at the end.
+        self.write_int32(<int32_t>size)
+        self.write_cstr(buf, size)
+
+    cdef write_frbuf(self, FRBuffer *buf):
+        cdef:
+            ssize_t buf_len = buf.len
+        if buf_len > 0:
+            self.write_cstr(frb_read_all(buf), buf_len)
+
+    cdef write_cstr(self, const char *data, ssize_t len):
+        self._check_readonly()
+        self._ensure_alloced(len)
+
+        memcpy(self._buf + self._length, <void*>data, <size_t>len)
+        self._length += len
+
+    cdef write_int16(self, int16_t i):
+        self._check_readonly()
+        self._ensure_alloced(2)
+
+        hton.pack_int16(&self._buf[self._length], i)
+        self._length += 2
+
+    cdef write_int32(self, int32_t i):
+        self._check_readonly()
+        self._ensure_alloced(4)
+
+        hton.pack_int32(&self._buf[self._length], i)
+        self._length += 4
+
+    cdef write_int64(self, int64_t i):
+        self._check_readonly()
+        self._ensure_alloced(8)
+
+        hton.pack_int64(&self._buf[self._length], i)
+        self._length += 8
+
+    cdef write_float(self, float f):
+        self._check_readonly()
+        self._ensure_alloced(4)
+
+        hton.pack_float(&self._buf[self._length], f)
+        self._length += 4
+
+    cdef write_double(self, double d):
+        self._check_readonly()
+        self._ensure_alloced(8)
+
+        hton.pack_double(&self._buf[self._length], d)
+        self._length += 8
+
+    @staticmethod
+    cdef WriteBuffer new_message(char type):
+        cdef WriteBuffer buf
+        buf = WriteBuffer.__new__(WriteBuffer)
+        buf.start_message(type)
+        return buf
+
+    @staticmethod
+    cdef WriteBuffer new():
+        cdef WriteBuffer buf
+        buf = WriteBuffer.__new__(WriteBuffer)
+        return buf
+
+
+@cython.no_gc_clear
+@cython.final
+@cython.freelist(_BUFFER_FREELIST_SIZE)
+cdef class ReadBuffer:
+
+    def __cinit__(self):
+        self._bufs = collections.deque()
+        self._bufs_append = self._bufs.append
+        self._bufs_popleft = self._bufs.popleft
+        self._bufs_len = 0
+        self._buf0 = None
+        self._buf0_prev = None
+        self._pos0 = 0
+        self._len0 = 0
+        self._length = 0
+
+        self._current_message_type = 0
+        self._current_message_len = 0
+        self._current_message_len_unread = 0
+        self._current_message_ready = 0
+
+    cdef feed_data(self, data):
+        cdef:
+            ssize_t dlen
+            bytes data_bytes
+
+        if not cpython.PyBytes_CheckExact(data):
+            if cpythonx.PyByteArray_CheckExact(data):
+                # ProactorEventLoop in Python 3.10+ seems to be sending
+                # bytearray objects instead of bytes.  Handle this here
+                # to avoid duplicating this check in every data_received().
+                data = bytes(data)
+            else:
+                raise BufferError(
+                    'feed_data: a bytes or bytearray object expected')
+
+        # Uncomment the below code to test code paths that
+        # read single int/str/bytes sequences are split over
+        # multiple received buffers.
+        #
+        # ll = 107
+        # if len(data) > ll:
+        #     self.feed_data(data[:ll])
+        #     self.feed_data(data[ll:])
+        #     return
+
+        data_bytes = <bytes>data
+
+        dlen = cpython.Py_SIZE(data_bytes)
+        if dlen == 0:
+            # EOF?
+            return
+
+        self._bufs_append(data_bytes)
+        self._length += dlen
+
+        if self._bufs_len == 0:
+            # First buffer
+            self._len0 = dlen
+            self._buf0 = data_bytes
+
+        self._bufs_len += 1
+
+    cdef inline _ensure_first_buf(self):
+        if PG_DEBUG:
+            if self._len0 == 0:
+                raise BufferError('empty first buffer')
+            if self._length == 0:
+                raise BufferError('empty buffer')
+
+        if self._pos0 == self._len0:
+            self._switch_to_next_buf()
+
+    cdef _switch_to_next_buf(self):
+        # The first buffer is fully read, discard it
+        self._bufs_popleft()
+        self._bufs_len -= 1
+
+        # Shouldn't fail, since we've checked that `_length >= 1`
+        # in _ensure_first_buf()
+        self._buf0_prev = self._buf0
+        self._buf0 = <bytes>self._bufs[0]
+
+        self._pos0 = 0
+        self._len0 = len(self._buf0)
+
+        if PG_DEBUG:
+            if self._len0 < 1:
+                raise BufferError(
+                    'debug: second buffer of ReadBuffer is empty')
+
+    cdef inline const char* _try_read_bytes(self, ssize_t nbytes):
+        # Try to read *nbytes* from the first buffer.
+        #
+        # Returns pointer to data if there is at least *nbytes*
+        # in the buffer, NULL otherwise.
+        #
+        # Important: caller must call _ensure_first_buf() prior
+        # to calling try_read_bytes, and must not overread
+
+        cdef:
+            const char *result
+
+        if PG_DEBUG:
+            if nbytes > self._length:
+                return NULL
+
+        if self._current_message_ready:
+            if self._current_message_len_unread < nbytes:
+                return NULL
+
+        if self._pos0 + nbytes <= self._len0:
+            result = cpython.PyBytes_AS_STRING(self._buf0)
+            result += self._pos0
+            self._pos0 += nbytes
+            self._length -= nbytes
+            if self._current_message_ready:
+                self._current_message_len_unread -= nbytes
+            return result
+        else:
+            return NULL
+
+    cdef inline _read_into(self, char *buf, ssize_t nbytes):
+        cdef:
+            ssize_t nread
+            char *buf0
+
+        while True:
+            buf0 = cpython.PyBytes_AS_STRING(self._buf0)
+
+            if self._pos0 + nbytes > self._len0:
+                nread = self._len0 - self._pos0
+                memcpy(buf, buf0 + self._pos0, <size_t>nread)
+                self._pos0 = self._len0
+                self._length -= nread
+                nbytes -= nread
+                buf += nread
+                self._ensure_first_buf()
+
+            else:
+                memcpy(buf, buf0 + self._pos0, <size_t>nbytes)
+                self._pos0 += nbytes
+                self._length -= nbytes
+                break
+
+    cdef inline _read_and_discard(self, ssize_t nbytes):
+        cdef:
+            ssize_t nread
+
+        self._ensure_first_buf()
+        while True:
+            if self._pos0 + nbytes > self._len0:
+                nread = self._len0 - self._pos0
+                self._pos0 = self._len0
+                self._length -= nread
+                nbytes -= nread
+                self._ensure_first_buf()
+
+            else:
+                self._pos0 += nbytes
+                self._length -= nbytes
+                break
+
+    cdef bytes read_bytes(self, ssize_t nbytes):
+        cdef:
+            bytes result
+            ssize_t nread
+            const char *cbuf
+            char *buf
+
+        self._ensure_first_buf()
+        cbuf = self._try_read_bytes(nbytes)
+        if cbuf != NULL:
+            return cpython.PyBytes_FromStringAndSize(cbuf, nbytes)
+
+        if nbytes > self._length:
+            raise BufferError(
+                'not enough data to read {} bytes'.format(nbytes))
+
+        if self._current_message_ready:
+            self._current_message_len_unread -= nbytes
+            if self._current_message_len_unread < 0:
+                raise BufferError('buffer overread')
+
+        result = cpython.PyBytes_FromStringAndSize(NULL, nbytes)
+        buf = cpython.PyBytes_AS_STRING(result)
+        self._read_into(buf, nbytes)
+        return result
+
+    cdef bytes read_len_prefixed_bytes(self):
+        cdef int32_t size = self.read_int32()
+        if size < 0:
+            raise BufferError(
+                'negative length for a len-prefixed bytes value')
+        if size == 0:
+            return b''
+        return self.read_bytes(size)
+
+    cdef str read_len_prefixed_utf8(self):
+        cdef:
+            int32_t size
+            const char *cbuf
+
+        size = self.read_int32()
+        if size < 0:
+            raise BufferError(
+                'negative length for a len-prefixed bytes value')
+
+        if size == 0:
+            return ''
+
+        self._ensure_first_buf()
+        cbuf = self._try_read_bytes(size)
+        if cbuf != NULL:
+            return cpython.PyUnicode_DecodeUTF8(cbuf, size, NULL)
+        else:
+            return self.read_bytes(size).decode('utf-8')
+
+    cdef read_uuid(self):
+        cdef:
+            bytes mem
+            const char *cbuf
+
+        self._ensure_first_buf()
+        cbuf = self._try_read_bytes(16)
+        if cbuf != NULL:
+            return pg_uuid_from_buf(cbuf)
+        else:
+            return pg_UUID(self.read_bytes(16))
+
+    cdef inline char read_byte(self) except? -1:
+        cdef const char *first_byte
+
+        if PG_DEBUG:
+            if not self._buf0:
+                raise BufferError(
+                    'debug: first buffer of ReadBuffer is empty')
+
+        self._ensure_first_buf()
+        first_byte = self._try_read_bytes(1)
+        if first_byte is NULL:
+            raise BufferError('not enough data to read one byte')
+
+        return first_byte[0]
+
+    cdef inline int64_t read_int64(self) except? -1:
+        cdef:
+            bytes mem
+            const char *cbuf
+
+        self._ensure_first_buf()
+        cbuf = self._try_read_bytes(8)
+        if cbuf != NULL:
+            return hton.unpack_int64(cbuf)
+        else:
+            mem = self.read_bytes(8)
+            return hton.unpack_int64(cpython.PyBytes_AS_STRING(mem))
+
+    cdef inline int32_t read_int32(self) except? -1:
+        cdef:
+            bytes mem
+            const char *cbuf
+
+        self._ensure_first_buf()
+        cbuf = self._try_read_bytes(4)
+        if cbuf != NULL:
+            return hton.unpack_int32(cbuf)
+        else:
+            mem = self.read_bytes(4)
+            return hton.unpack_int32(cpython.PyBytes_AS_STRING(mem))
+
+    cdef inline int16_t read_int16(self) except? -1:
+        cdef:
+            bytes mem
+            const char *cbuf
+
+        self._ensure_first_buf()
+        cbuf = self._try_read_bytes(2)
+        if cbuf != NULL:
+            return hton.unpack_int16(cbuf)
+        else:
+            mem = self.read_bytes(2)
+            return hton.unpack_int16(cpython.PyBytes_AS_STRING(mem))
+
+    cdef inline read_null_str(self):
+        if not self._current_message_ready:
+            raise BufferError(
+                'read_null_str only works when the message guaranteed '
+                'to be in the buffer')
+
+        cdef:
+            ssize_t pos
+            ssize_t nread
+            bytes result
+            const char *buf
+            const char *buf_start
+
+        self._ensure_first_buf()
+
+        buf_start = cpython.PyBytes_AS_STRING(self._buf0)
+        buf = buf_start + self._pos0
+        while buf - buf_start < self._len0:
+            if buf[0] == 0:
+                pos = buf - buf_start
+                nread = pos - self._pos0
+                buf = self._try_read_bytes(nread + 1)
+                if buf != NULL:
+                    return cpython.PyBytes_FromStringAndSize(buf, nread)
+                else:
+                    break
+            else:
+                buf += 1
+
+        result = b''
+        while True:
+            pos = self._buf0.find(b'\x00', self._pos0)
+            if pos >= 0:
+                result += self._buf0[self._pos0 : pos]
+                nread = pos - self._pos0 + 1
+                self._pos0 = pos + 1
+                self._length -= nread
+
+                self._current_message_len_unread -= nread
+                if self._current_message_len_unread < 0:
+                    raise BufferError(
+                        'read_null_str: buffer overread')
+
+                return result
+
+            else:
+                result += self._buf0[self._pos0:]
+                nread = self._len0 - self._pos0
+                self._pos0 = self._len0
+                self._length -= nread
+
+                self._current_message_len_unread -= nread
+                if self._current_message_len_unread < 0:
+                    raise BufferError(
+                        'read_null_str: buffer overread')
+
+                self._ensure_first_buf()
+
+    cdef int32_t take_message(self) except -1:
+        cdef:
+            const char *cbuf
+
+        if self._current_message_ready:
+            return 1
+
+        if self._current_message_type == 0:
+            if self._length < 1:
+                return 0
+            self._ensure_first_buf()
+            cbuf = self._try_read_bytes(1)
+            if cbuf == NULL:
+                raise BufferError(
+                    'failed to read one byte on a non-empty buffer')
+            self._current_message_type = cbuf[0]
+
+        if self._current_message_len == 0:
+            if self._length < 4:
+                return 0
+
+            self._ensure_first_buf()
+            cbuf = self._try_read_bytes(4)
+            if cbuf != NULL:
+                self._current_message_len = hton.unpack_int32(cbuf)
+            else:
+                self._current_message_len = self.read_int32()
+
+            self._current_message_len_unread = self._current_message_len - 4
+
+        if self._length < self._current_message_len_unread:
+            return 0
+
+        self._current_message_ready = 1
+        return 1
+
+    cdef inline int32_t take_message_type(self, char mtype) except -1:
+        cdef const char *buf0
+
+        if self._current_message_ready:
+            return self._current_message_type == mtype
+        elif self._length >= 1:
+            self._ensure_first_buf()
+            buf0 = cpython.PyBytes_AS_STRING(self._buf0)
+
+            return buf0[self._pos0] == mtype and self.take_message()
+        else:
+            return 0
+
+    cdef int32_t put_message(self) except -1:
+        if not self._current_message_ready:
+            raise BufferError(
+                'cannot put message: no message taken')
+        self._current_message_ready = False
+        return 0
+
+    cdef inline const char* try_consume_message(self, ssize_t* len):
+        cdef:
+            ssize_t buf_len
+            const char *buf
+
+        if not self._current_message_ready:
+            return NULL
+
+        self._ensure_first_buf()
+        buf_len = self._current_message_len_unread
+        buf = self._try_read_bytes(buf_len)
+        if buf != NULL:
+            len[0] = buf_len
+            self._finish_message()
+        return buf
+
+    cdef discard_message(self):
+        if not self._current_message_ready:
+            raise BufferError('no message to discard')
+        if self._current_message_len_unread > 0:
+            self._read_and_discard(self._current_message_len_unread)
+            self._current_message_len_unread = 0
+        self._finish_message()
+
+    cdef bytes consume_message(self):
+        if not self._current_message_ready:
+            raise BufferError('no message to consume')
+        if self._current_message_len_unread > 0:
+            mem = self.read_bytes(self._current_message_len_unread)
+        else:
+            mem = b''
+        self._finish_message()
+        return mem
+
+    cdef int32_t redirect_messages(self, WriteBuffer buf, char mtype,
+                           int stop_at=0):
+        # Redirects messages from self into buf until either
+        # a message with a type different than mtype is encountered, or
+        # buf contains stop_at bytes.
+        # Returns the number of messages redirected.
+
+        if not self._current_message_ready:
+            raise BufferError(
+                'consume_full_messages called on a buffer without a '
+                'complete first message')
+        if mtype != self._current_message_type:
+            raise BufferError(
+                'consume_full_messages called with a wrong mtype')
+        if self._current_message_len_unread != self._current_message_len - 4:
+            raise BufferError(
+                'consume_full_messages called on a partially read message')
+
+        cdef:
+            const char* cbuf
+            ssize_t cbuf_len
+            int32_t msg_len
+            ssize_t new_pos0
+            ssize_t pos_delta
+            int32_t done
+            int32_t count
+
+        count = 0
+        while True:
+            count += 1
+            buf.write_byte(mtype)
+            buf.write_int32(self._current_message_len)
+
+            cbuf = self.try_consume_message(&cbuf_len)
+            if cbuf != NULL:
+                buf.write_cstr(cbuf, cbuf_len)
+            else:
+                buf.write_bytes(self.consume_message())
+
+            if self._length > 0:
+                self._ensure_first_buf()
+            else:
+                return count
+
+            if stop_at and buf._length >= stop_at:
+                return count
+
+           # Fast path: exhaust buf0 as efficiently as possible.
+            if self._pos0 + 5 <= self._len0:
+                cbuf = cpython.PyBytes_AS_STRING(self._buf0)
+                new_pos0 = self._pos0
+                cbuf_len = self._len0
+
+                done = 0
+                # Scan the first buffer and find the position of the
+                # end of the last "mtype" message.
+                while new_pos0 + 5 <= cbuf_len:
+                    if (cbuf + new_pos0)[0] != mtype:
+                        done = 1
+                        break
+                    if (stop_at and
+                            (buf._length + new_pos0 - self._pos0) > stop_at):
+                        done = 1
+                        break
+                    msg_len = hton.unpack_int32(cbuf + new_pos0 + 1) + 1
+                    if new_pos0 + msg_len > cbuf_len:
+                        break
+                    new_pos0 += msg_len
+                    count += 1
+
+                if new_pos0 != self._pos0:
+                    assert self._pos0 < new_pos0 <= self._len0
+
+                    pos_delta = new_pos0 - self._pos0
+                    buf.write_cstr(
+                        cbuf + self._pos0,
+                        pos_delta
+                    )
+
+                    self._pos0 = new_pos0
+                    self._length -= pos_delta
+
+                    assert self._length >= 0
+
+                if done:
+                    # The next message is of a different type.
+                    return count
+
+            # Back to slow path.
+            if not self.take_message_type(mtype):
+                return count
+
+    cdef bytearray consume_messages(self, char mtype):
+        """Consume consecutive messages of the same type."""
+        cdef:
+            char *buf
+            ssize_t nbytes
+            ssize_t total_bytes = 0
+            bytearray result
+
+        if not self.take_message_type(mtype):
+            return None
+
+        # consume_messages is a volume-oriented method, so
+        # we assume that the remainder of the buffer will contain
+        # messages of the requested type.
+        result = cpythonx.PyByteArray_FromStringAndSize(NULL, self._length)
+        buf = cpythonx.PyByteArray_AsString(result)
+
+        while self.take_message_type(mtype):
+            self._ensure_first_buf()
+            nbytes = self._current_message_len_unread
+            self._read_into(buf, nbytes)
+            buf += nbytes
+            total_bytes += nbytes
+            self._finish_message()
+
+        # Clamp the result to an actual size read.
+        cpythonx.PyByteArray_Resize(result, total_bytes)
+
+        return result
+
+    cdef finish_message(self):
+        if self._current_message_type == 0 or not self._current_message_ready:
+            # The message has already been finished (e.g by consume_message()),
+            # or has been put back by put_message().
+            return
+
+        if self._current_message_len_unread:
+            if PG_DEBUG:
+                mtype = chr(self._current_message_type)
+
+            discarded = self.consume_message()
+
+            if PG_DEBUG:
+                print('!!! discarding message {!r} unread data: {!r}'.format(
+                    mtype,
+                    discarded))
+
+        self._finish_message()
+
+    cdef inline _finish_message(self):
+        self._current_message_type = 0
+        self._current_message_len = 0
+        self._current_message_ready = 0
+        self._current_message_len_unread = 0
+
+    @staticmethod
+    cdef ReadBuffer new_message_parser(object data):
+        cdef ReadBuffer buf
+
+        buf = ReadBuffer.__new__(ReadBuffer)
+        buf.feed_data(data)
+
+        buf._current_message_ready = 1
+        buf._current_message_len_unread = buf._len0
+
+        return buf

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/__init__.pxd

@@ -0,0 +1,159 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef class CodecContext:
+
+    cpdef get_text_codec(self)
+    cdef is_encoding_utf8(self)
+    cpdef get_json_decoder(self)
+    cdef is_decoding_json(self)
+    cpdef get_json_encoder(self)
+    cdef is_encoding_json(self)
+
+
+ctypedef object (*encode_func)(CodecContext settings,
+                               WriteBuffer buf,
+                               object obj)
+
+ctypedef object (*decode_func)(CodecContext settings,
+                               FRBuffer *buf)
+
+
+# Datetime
+cdef date_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef date_decode(CodecContext settings, FRBuffer * buf)
+cdef date_encode_tuple(CodecContext settings, WriteBuffer buf, obj)
+cdef date_decode_tuple(CodecContext settings, FRBuffer * buf)
+cdef timestamp_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef timestamp_decode(CodecContext settings, FRBuffer * buf)
+cdef timestamp_encode_tuple(CodecContext settings, WriteBuffer buf, obj)
+cdef timestamp_decode_tuple(CodecContext settings, FRBuffer * buf)
+cdef timestamptz_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef timestamptz_decode(CodecContext settings, FRBuffer * buf)
+cdef time_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef time_decode(CodecContext settings, FRBuffer * buf)
+cdef time_encode_tuple(CodecContext settings, WriteBuffer buf, obj)
+cdef time_decode_tuple(CodecContext settings, FRBuffer * buf)
+cdef timetz_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef timetz_decode(CodecContext settings, FRBuffer * buf)
+cdef timetz_encode_tuple(CodecContext settings, WriteBuffer buf, obj)
+cdef timetz_decode_tuple(CodecContext settings, FRBuffer * buf)
+cdef interval_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef interval_decode(CodecContext settings, FRBuffer * buf)
+cdef interval_encode_tuple(CodecContext settings, WriteBuffer buf, tuple obj)
+cdef interval_decode_tuple(CodecContext settings, FRBuffer * buf)
+
+
+# Bits
+cdef bits_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef bits_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Bools
+cdef bool_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef bool_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Geometry
+cdef box_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef box_decode(CodecContext settings, FRBuffer * buf)
+cdef line_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef line_decode(CodecContext settings, FRBuffer * buf)
+cdef lseg_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef lseg_decode(CodecContext settings, FRBuffer * buf)
+cdef point_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef point_decode(CodecContext settings, FRBuffer * buf)
+cdef path_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef path_decode(CodecContext settings, FRBuffer * buf)
+cdef poly_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef poly_decode(CodecContext settings, FRBuffer * buf)
+cdef circle_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef circle_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Hstore
+cdef hstore_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef hstore_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Ints
+cdef int2_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef int2_decode(CodecContext settings, FRBuffer * buf)
+cdef int4_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef int4_decode(CodecContext settings, FRBuffer * buf)
+cdef uint4_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef uint4_decode(CodecContext settings, FRBuffer * buf)
+cdef int8_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef int8_decode(CodecContext settings, FRBuffer * buf)
+cdef uint8_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef uint8_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Floats
+cdef float4_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef float4_decode(CodecContext settings, FRBuffer * buf)
+cdef float8_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef float8_decode(CodecContext settings, FRBuffer * buf)
+
+
+# JSON
+cdef jsonb_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef jsonb_decode(CodecContext settings, FRBuffer * buf)
+cdef json_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef json_decode(CodecContext settings, FRBuffer *buf)
+
+
+# JSON path
+cdef jsonpath_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef jsonpath_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Text
+cdef as_pg_string_and_size(
+        CodecContext settings, obj, char **cstr, ssize_t *size)
+cdef text_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef text_decode(CodecContext settings, FRBuffer * buf)
+
+# Bytea
+cdef bytea_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef bytea_decode(CodecContext settings, FRBuffer * buf)
+
+
+# UUID
+cdef uuid_encode(CodecContext settings, WriteBuffer wbuf, obj)
+cdef uuid_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Numeric
+cdef numeric_encode_text(CodecContext settings, WriteBuffer buf, obj)
+cdef numeric_decode_text(CodecContext settings, FRBuffer * buf)
+cdef numeric_encode_binary(CodecContext settings, WriteBuffer buf, obj)
+cdef numeric_decode_binary(CodecContext settings, FRBuffer * buf)
+cdef numeric_decode_binary_ex(CodecContext settings, FRBuffer * buf,
+                              bint trail_fract_zero)
+
+
+# Void
+cdef void_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef void_decode(CodecContext settings, FRBuffer * buf)
+
+
+# tid
+cdef tid_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef tid_decode(CodecContext settings, FRBuffer * buf)
+
+
+# Network
+cdef cidr_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef cidr_decode(CodecContext settings, FRBuffer * buf)
+cdef inet_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef inet_decode(CodecContext settings, FRBuffer * buf)
+
+
+# pg_snapshot
+cdef pg_snapshot_encode(CodecContext settings, WriteBuffer buf, obj)
+cdef pg_snapshot_decode(CodecContext settings, FRBuffer * buf)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/bits.pyx

@@ -0,0 +1,47 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef bits_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    cdef:
+        Py_buffer pybuf
+        bint pybuf_used = False
+        char *buf
+        ssize_t len
+        ssize_t bitlen
+
+    if cpython.PyBytes_CheckExact(obj):
+        buf = cpython.PyBytes_AS_STRING(obj)
+        len = cpython.Py_SIZE(obj)
+        bitlen = len * 8
+    elif isinstance(obj, pgproto_types.BitString):
+        cpython.PyBytes_AsStringAndSize(obj.bytes, &buf, &len)
+        bitlen = obj.__len__()
+    else:
+        cpython.PyObject_GetBuffer(obj, &pybuf, cpython.PyBUF_SIMPLE)
+        pybuf_used = True
+        buf = <char*>pybuf.buf
+        len = pybuf.len
+        bitlen = len * 8
+
+    try:
+        if bitlen > _MAXINT32:
+            raise ValueError('bit value too long')
+        wbuf.write_int32(4 + <int32_t>len)
+        wbuf.write_int32(<int32_t>bitlen)
+        wbuf.write_cstr(buf, len)
+    finally:
+        if pybuf_used:
+            cpython.PyBuffer_Release(&pybuf)
+
+
+cdef bits_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int32_t bitlen = hton.unpack_int32(frb_read(buf, 4))
+        ssize_t buf_len = buf.len
+
+    bytes_ = cpython.PyBytes_FromStringAndSize(frb_read_all(buf), buf_len)
+    return pgproto_types.BitString.frombytes(bytes_, bitlen)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/bytea.pyx

@@ -0,0 +1,34 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef bytea_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    cdef:
+        Py_buffer pybuf
+        bint pybuf_used = False
+        char *buf
+        ssize_t len
+
+    if cpython.PyBytes_CheckExact(obj):
+        buf = cpython.PyBytes_AS_STRING(obj)
+        len = cpython.Py_SIZE(obj)
+    else:
+        cpython.PyObject_GetBuffer(obj, &pybuf, cpython.PyBUF_SIMPLE)
+        pybuf_used = True
+        buf = <char*>pybuf.buf
+        len = pybuf.len
+
+    try:
+        wbuf.write_int32(<int32_t>len)
+        wbuf.write_cstr(buf, len)
+    finally:
+        if pybuf_used:
+            cpython.PyBuffer_Release(&pybuf)
+
+
+cdef bytea_decode(CodecContext settings, FRBuffer *buf):
+    cdef ssize_t buf_len = buf.len
+    return cpython.PyBytes_FromStringAndSize(frb_read_all(buf), buf_len)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/context.pyx

@@ -0,0 +1,26 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef class CodecContext:
+
+    cpdef get_text_codec(self):
+        raise NotImplementedError
+
+    cdef is_encoding_utf8(self):
+        raise NotImplementedError
+
+    cpdef get_json_decoder(self):
+        raise NotImplementedError
+
+    cdef is_decoding_json(self):
+        return False
+
+    cpdef get_json_encoder(self):
+        raise NotImplementedError
+
+    cdef is_encoding_json(self):
+        return False

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/datetime.pyx

@@ -0,0 +1,423 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cimport cpython.datetime
+import datetime
+
+cpython.datetime.import_datetime()
+
+utc = datetime.timezone.utc
+date_from_ordinal = datetime.date.fromordinal
+timedelta = datetime.timedelta
+
+pg_epoch_datetime = datetime.datetime(2000, 1, 1)
+cdef int32_t pg_epoch_datetime_ts = \
+    <int32_t>cpython.PyLong_AsLong(int(pg_epoch_datetime.timestamp()))
+
+pg_epoch_datetime_utc = datetime.datetime(2000, 1, 1, tzinfo=utc)
+cdef int32_t pg_epoch_datetime_utc_ts = \
+    <int32_t>cpython.PyLong_AsLong(int(pg_epoch_datetime_utc.timestamp()))
+
+pg_epoch_date = datetime.date(2000, 1, 1)
+cdef int32_t pg_date_offset_ord = \
+    <int32_t>cpython.PyLong_AsLong(pg_epoch_date.toordinal())
+
+# Binary representations of infinity for datetimes.
+cdef const int64_t pg_time64_infinity = 0x7fffffffffffffff
+cdef const int64_t pg_time64_negative_infinity = <int64_t>0x8000000000000000
+cdef const int32_t pg_date_infinity = 0x7fffffff
+cdef const int32_t pg_date_negative_infinity = <int32_t>0x80000000
+
+infinity_datetime = datetime.datetime(
+    datetime.MAXYEAR, 12, 31, 23, 59, 59, 999999)
+
+cdef int32_t infinity_datetime_ord = <int32_t>cpython.PyLong_AsLong(
+    infinity_datetime.toordinal())
+
+cdef int64_t infinity_datetime_ts = 252455615999999999
+
+negative_infinity_datetime = datetime.datetime(
+    datetime.MINYEAR, 1, 1, 0, 0, 0, 0)
+
+cdef int32_t negative_infinity_datetime_ord = <int32_t>cpython.PyLong_AsLong(
+    negative_infinity_datetime.toordinal())
+
+cdef int64_t negative_infinity_datetime_ts = -63082281600000000
+
+infinity_date = datetime.date(datetime.MAXYEAR, 12, 31)
+
+cdef int32_t infinity_date_ord = <int32_t>cpython.PyLong_AsLong(
+    infinity_date.toordinal())
+
+negative_infinity_date = datetime.date(datetime.MINYEAR, 1, 1)
+
+cdef int32_t negative_infinity_date_ord = <int32_t>cpython.PyLong_AsLong(
+    negative_infinity_date.toordinal())
+
+
+cdef inline _local_timezone():
+    d = datetime.datetime.now(datetime.timezone.utc).astimezone()
+    return datetime.timezone(d.utcoffset())
+
+
+cdef inline _encode_time(WriteBuffer buf, int64_t seconds,
+                         int32_t microseconds):
+    # XXX: add support for double timestamps
+    # int64 timestamps,
+    cdef int64_t ts = seconds * 1000000 + microseconds
+
+    if ts == infinity_datetime_ts:
+        buf.write_int64(pg_time64_infinity)
+    elif ts == negative_infinity_datetime_ts:
+        buf.write_int64(pg_time64_negative_infinity)
+    else:
+        buf.write_int64(ts)
+
+
+cdef inline int32_t _decode_time(FRBuffer *buf, int64_t *seconds,
+                                 int32_t *microseconds):
+    cdef int64_t ts = hton.unpack_int64(frb_read(buf, 8))
+
+    if ts == pg_time64_infinity:
+        return 1
+    elif ts == pg_time64_negative_infinity:
+        return -1
+    else:
+        seconds[0] = ts // 1000000
+        microseconds[0] = <int32_t>(ts % 1000000)
+        return 0
+
+
+cdef date_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        int32_t ordinal = <int32_t>cpython.PyLong_AsLong(obj.toordinal())
+        int32_t pg_ordinal
+
+    if ordinal == infinity_date_ord:
+        pg_ordinal = pg_date_infinity
+    elif ordinal == negative_infinity_date_ord:
+        pg_ordinal = pg_date_negative_infinity
+    else:
+        pg_ordinal = ordinal - pg_date_offset_ord
+
+    buf.write_int32(4)
+    buf.write_int32(pg_ordinal)
+
+
+cdef date_encode_tuple(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        int32_t pg_ordinal
+
+    if len(obj) != 1:
+        raise ValueError(
+            'date tuple encoder: expecting 1 element '
+            'in tuple, got {}'.format(len(obj)))
+
+    pg_ordinal = obj[0]
+    buf.write_int32(4)
+    buf.write_int32(pg_ordinal)
+
+
+cdef date_decode(CodecContext settings, FRBuffer *buf):
+    cdef int32_t pg_ordinal = hton.unpack_int32(frb_read(buf, 4))
+
+    if pg_ordinal == pg_date_infinity:
+        return infinity_date
+    elif pg_ordinal == pg_date_negative_infinity:
+        return negative_infinity_date
+    else:
+        return date_from_ordinal(pg_ordinal + pg_date_offset_ord)
+
+
+cdef date_decode_tuple(CodecContext settings, FRBuffer *buf):
+    cdef int32_t pg_ordinal = hton.unpack_int32(frb_read(buf, 4))
+
+    return (pg_ordinal,)
+
+
+cdef timestamp_encode(CodecContext settings, WriteBuffer buf, obj):
+    if not cpython.datetime.PyDateTime_Check(obj):
+        if cpython.datetime.PyDate_Check(obj):
+            obj = datetime.datetime(obj.year, obj.month, obj.day)
+        else:
+            raise TypeError(
+                'expected a datetime.date or datetime.datetime instance, '
+                'got {!r}'.format(type(obj).__name__)
+            )
+
+    delta = obj - pg_epoch_datetime
+    cdef:
+        int64_t seconds = cpython.PyLong_AsLongLong(delta.days) * 86400 + \
+                                cpython.PyLong_AsLong(delta.seconds)
+        int32_t microseconds = <int32_t>cpython.PyLong_AsLong(
+                                    delta.microseconds)
+
+    buf.write_int32(8)
+    _encode_time(buf, seconds, microseconds)
+
+
+cdef timestamp_encode_tuple(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        int64_t microseconds
+
+    if len(obj) != 1:
+        raise ValueError(
+            'timestamp tuple encoder: expecting 1 element '
+            'in tuple, got {}'.format(len(obj)))
+
+    microseconds = obj[0]
+
+    buf.write_int32(8)
+    buf.write_int64(microseconds)
+
+
+cdef timestamp_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int64_t seconds = 0
+        int32_t microseconds = 0
+        int32_t inf = _decode_time(buf, &seconds, &microseconds)
+
+    if inf > 0:
+        # positive infinity
+        return infinity_datetime
+    elif inf < 0:
+        # negative infinity
+        return negative_infinity_datetime
+    else:
+        return pg_epoch_datetime.__add__(
+            timedelta(0, seconds, microseconds))
+
+
+cdef timestamp_decode_tuple(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int64_t ts = hton.unpack_int64(frb_read(buf, 8))
+
+    return (ts,)
+
+
+cdef timestamptz_encode(CodecContext settings, WriteBuffer buf, obj):
+    if not cpython.datetime.PyDateTime_Check(obj):
+        if cpython.datetime.PyDate_Check(obj):
+            obj = datetime.datetime(obj.year, obj.month, obj.day,
+                                    tzinfo=_local_timezone())
+        else:
+            raise TypeError(
+                'expected a datetime.date or datetime.datetime instance, '
+                'got {!r}'.format(type(obj).__name__)
+            )
+
+    buf.write_int32(8)
+
+    if obj == infinity_datetime:
+        buf.write_int64(pg_time64_infinity)
+        return
+    elif obj == negative_infinity_datetime:
+        buf.write_int64(pg_time64_negative_infinity)
+        return
+
+    utc_dt = obj.astimezone(utc)
+
+    delta = utc_dt - pg_epoch_datetime_utc
+    cdef:
+        int64_t seconds = cpython.PyLong_AsLongLong(delta.days) * 86400 + \
+                                cpython.PyLong_AsLong(delta.seconds)
+        int32_t microseconds = <int32_t>cpython.PyLong_AsLong(
+                                    delta.microseconds)
+
+    _encode_time(buf, seconds, microseconds)
+
+
+cdef timestamptz_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int64_t seconds = 0
+        int32_t microseconds = 0
+        int32_t inf = _decode_time(buf, &seconds, &microseconds)
+
+    if inf > 0:
+        # positive infinity
+        return infinity_datetime
+    elif inf < 0:
+        # negative infinity
+        return negative_infinity_datetime
+    else:
+        return pg_epoch_datetime_utc.__add__(
+            timedelta(0, seconds, microseconds))
+
+
+cdef time_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        int64_t seconds = cpython.PyLong_AsLong(obj.hour) * 3600 + \
+                            cpython.PyLong_AsLong(obj.minute) * 60 + \
+                            cpython.PyLong_AsLong(obj.second)
+        int32_t microseconds = <int32_t>cpython.PyLong_AsLong(obj.microsecond)
+
+    buf.write_int32(8)
+    _encode_time(buf, seconds, microseconds)
+
+
+cdef time_encode_tuple(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        int64_t microseconds
+
+    if len(obj) != 1:
+        raise ValueError(
+            'time tuple encoder: expecting 1 element '
+            'in tuple, got {}'.format(len(obj)))
+
+    microseconds = obj[0]
+
+    buf.write_int32(8)
+    buf.write_int64(microseconds)
+
+
+cdef time_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int64_t seconds = 0
+        int32_t microseconds = 0
+
+    _decode_time(buf, &seconds, &microseconds)
+
+    cdef:
+        int64_t minutes = <int64_t>(seconds / 60)
+        int64_t sec = seconds % 60
+        int64_t hours = <int64_t>(minutes / 60)
+        int64_t min = minutes % 60
+
+    return datetime.time(hours, min, sec, microseconds)
+
+
+cdef time_decode_tuple(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int64_t ts = hton.unpack_int64(frb_read(buf, 8))
+
+    return (ts,)
+
+
+cdef timetz_encode(CodecContext settings, WriteBuffer buf, obj):
+    offset = obj.tzinfo.utcoffset(None)
+
+    cdef:
+        int32_t offset_sec = \
+            <int32_t>cpython.PyLong_AsLong(offset.days) * 24 * 60 * 60 + \
+            <int32_t>cpython.PyLong_AsLong(offset.seconds)
+
+        int64_t seconds = cpython.PyLong_AsLong(obj.hour) * 3600 + \
+                            cpython.PyLong_AsLong(obj.minute) * 60 + \
+                            cpython.PyLong_AsLong(obj.second)
+
+        int32_t microseconds = <int32_t>cpython.PyLong_AsLong(obj.microsecond)
+
+    buf.write_int32(12)
+    _encode_time(buf, seconds, microseconds)
+    # In Python utcoffset() is the difference between the local time
+    # and the UTC, whereas in PostgreSQL it's the opposite,
+    # so we need to flip the sign.
+    buf.write_int32(-offset_sec)
+
+
+cdef timetz_encode_tuple(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        int64_t microseconds
+        int32_t offset_sec
+
+    if len(obj) != 2:
+        raise ValueError(
+            'time tuple encoder: expecting 2 elements2 '
+            'in tuple, got {}'.format(len(obj)))
+
+    microseconds = obj[0]
+    offset_sec = obj[1]
+
+    buf.write_int32(12)
+    buf.write_int64(microseconds)
+    buf.write_int32(offset_sec)
+
+
+cdef timetz_decode(CodecContext settings, FRBuffer *buf):
+    time = time_decode(settings, buf)
+    cdef int32_t offset = <int32_t>(hton.unpack_int32(frb_read(buf, 4)) / 60)
+    # See the comment in the `timetz_encode` method.
+    return time.replace(tzinfo=datetime.timezone(timedelta(minutes=-offset)))
+
+
+cdef timetz_decode_tuple(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int64_t microseconds = hton.unpack_int64(frb_read(buf, 8))
+        int32_t offset_sec = hton.unpack_int32(frb_read(buf, 4))
+
+    return (microseconds, offset_sec)
+
+
+cdef interval_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        int32_t days = <int32_t>cpython.PyLong_AsLong(obj.days)
+        int64_t seconds = cpython.PyLong_AsLongLong(obj.seconds)
+        int32_t microseconds = <int32_t>cpython.PyLong_AsLong(obj.microseconds)
+
+    buf.write_int32(16)
+    _encode_time(buf, seconds, microseconds)
+    buf.write_int32(days)
+    buf.write_int32(0) # Months
+
+
+cdef interval_encode_tuple(CodecContext settings, WriteBuffer buf,
+                           tuple obj):
+    cdef:
+        int32_t months
+        int32_t days
+        int64_t microseconds
+
+    if len(obj) != 3:
+        raise ValueError(
+            'interval tuple encoder: expecting 3 elements '
+            'in tuple, got {}'.format(len(obj)))
+
+    months = obj[0]
+    days = obj[1]
+    microseconds = obj[2]
+
+    buf.write_int32(16)
+    buf.write_int64(microseconds)
+    buf.write_int32(days)
+    buf.write_int32(months)
+
+
+cdef interval_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int32_t days
+        int32_t months
+        int32_t years
+        int64_t seconds = 0
+        int32_t microseconds = 0
+
+    _decode_time(buf, &seconds, &microseconds)
+
+    days = hton.unpack_int32(frb_read(buf, 4))
+    months = hton.unpack_int32(frb_read(buf, 4))
+
+    if months < 0:
+        years = -<int32_t>(-months // 12)
+        months = -<int32_t>(-months % 12)
+    else:
+        years = <int32_t>(months // 12)
+        months = <int32_t>(months % 12)
+
+    return datetime.timedelta(days=days + months * 30 + years * 365,
+                              seconds=seconds, microseconds=microseconds)
+
+
+cdef interval_decode_tuple(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int32_t days
+        int32_t months
+        int64_t microseconds
+
+    microseconds = hton.unpack_int64(frb_read(buf, 8))
+    days = hton.unpack_int32(frb_read(buf, 4))
+    months = hton.unpack_int32(frb_read(buf, 4))
+
+    return (months, days, microseconds)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/float.pyx

@@ -0,0 +1,34 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from libc cimport math
+
+
+cdef float4_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef double dval = cpython.PyFloat_AsDouble(obj)
+    cdef float fval = <float>dval
+    if math.isinf(fval) and not math.isinf(dval):
+        raise ValueError('value out of float32 range')
+
+    buf.write_int32(4)
+    buf.write_float(fval)
+
+
+cdef float4_decode(CodecContext settings, FRBuffer *buf):
+    cdef float f = hton.unpack_float(frb_read(buf, 4))
+    return cpython.PyFloat_FromDouble(f)
+
+
+cdef float8_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef double dval = cpython.PyFloat_AsDouble(obj)
+    buf.write_int32(8)
+    buf.write_double(dval)
+
+
+cdef float8_decode(CodecContext settings, FRBuffer *buf):
+    cdef double f = hton.unpack_double(frb_read(buf, 8))
+    return cpython.PyFloat_FromDouble(f)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/geometry.pyx

@@ -0,0 +1,164 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef inline _encode_points(WriteBuffer wbuf, object points):
+    cdef object point
+
+    for point in points:
+        wbuf.write_double(point[0])
+        wbuf.write_double(point[1])
+
+
+cdef inline _decode_points(FRBuffer *buf):
+    cdef:
+        int32_t npts = hton.unpack_int32(frb_read(buf, 4))
+        pts = cpython.PyTuple_New(npts)
+        int32_t i
+        object point
+        double x
+        double y
+
+    for i in range(npts):
+        x = hton.unpack_double(frb_read(buf, 8))
+        y = hton.unpack_double(frb_read(buf, 8))
+        point = pgproto_types.Point(x, y)
+        cpython.Py_INCREF(point)
+        cpython.PyTuple_SET_ITEM(pts, i, point)
+
+    return pts
+
+
+cdef box_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    wbuf.write_int32(32)
+    _encode_points(wbuf, (obj[0], obj[1]))
+
+
+cdef box_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        double high_x = hton.unpack_double(frb_read(buf, 8))
+        double high_y = hton.unpack_double(frb_read(buf, 8))
+        double low_x = hton.unpack_double(frb_read(buf, 8))
+        double low_y = hton.unpack_double(frb_read(buf, 8))
+
+    return pgproto_types.Box(
+        pgproto_types.Point(high_x, high_y),
+        pgproto_types.Point(low_x, low_y))
+
+
+cdef line_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    wbuf.write_int32(24)
+    wbuf.write_double(obj[0])
+    wbuf.write_double(obj[1])
+    wbuf.write_double(obj[2])
+
+
+cdef line_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        double A = hton.unpack_double(frb_read(buf, 8))
+        double B = hton.unpack_double(frb_read(buf, 8))
+        double C = hton.unpack_double(frb_read(buf, 8))
+
+    return pgproto_types.Line(A, B, C)
+
+
+cdef lseg_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    wbuf.write_int32(32)
+    _encode_points(wbuf, (obj[0], obj[1]))
+
+
+cdef lseg_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        double p1_x = hton.unpack_double(frb_read(buf, 8))
+        double p1_y = hton.unpack_double(frb_read(buf, 8))
+        double p2_x = hton.unpack_double(frb_read(buf, 8))
+        double p2_y = hton.unpack_double(frb_read(buf, 8))
+
+    return pgproto_types.LineSegment((p1_x, p1_y), (p2_x, p2_y))
+
+
+cdef point_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    wbuf.write_int32(16)
+    wbuf.write_double(obj[0])
+    wbuf.write_double(obj[1])
+
+
+cdef point_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        double x = hton.unpack_double(frb_read(buf, 8))
+        double y = hton.unpack_double(frb_read(buf, 8))
+
+    return pgproto_types.Point(x, y)
+
+
+cdef path_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    cdef:
+        int8_t is_closed = 0
+        ssize_t npts
+        ssize_t encoded_len
+        int32_t i
+
+    if cpython.PyTuple_Check(obj):
+        is_closed = 1
+    elif cpython.PyList_Check(obj):
+        is_closed = 0
+    elif isinstance(obj, pgproto_types.Path):
+        is_closed = obj.is_closed
+
+    npts = len(obj)
+    encoded_len = 1 + 4 + 16 * npts
+    if encoded_len > _MAXINT32:
+        raise ValueError('path value too long')
+
+    wbuf.write_int32(<int32_t>encoded_len)
+    wbuf.write_byte(is_closed)
+    wbuf.write_int32(<int32_t>npts)
+
+    _encode_points(wbuf, obj)
+
+
+cdef path_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int8_t is_closed = <int8_t>(frb_read(buf, 1)[0])
+
+    return pgproto_types.Path(*_decode_points(buf), is_closed=is_closed == 1)
+
+
+cdef poly_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    cdef:
+        bint is_closed
+        ssize_t npts
+        ssize_t encoded_len
+        int32_t i
+
+    npts = len(obj)
+    encoded_len = 4 + 16 * npts
+    if encoded_len > _MAXINT32:
+        raise ValueError('polygon value too long')
+
+    wbuf.write_int32(<int32_t>encoded_len)
+    wbuf.write_int32(<int32_t>npts)
+    _encode_points(wbuf, obj)
+
+
+cdef poly_decode(CodecContext settings, FRBuffer *buf):
+    return pgproto_types.Polygon(*_decode_points(buf))
+
+
+cdef circle_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    wbuf.write_int32(24)
+    wbuf.write_double(obj[0][0])
+    wbuf.write_double(obj[0][1])
+    wbuf.write_double(obj[1])
+
+
+cdef circle_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        double center_x = hton.unpack_double(frb_read(buf, 8))
+        double center_y = hton.unpack_double(frb_read(buf, 8))
+        double radius = hton.unpack_double(frb_read(buf, 8))
+
+    return pgproto_types.Circle((center_x, center_y), radius)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/hstore.pyx

@@ -0,0 +1,73 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef hstore_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        char *str
+        ssize_t size
+        ssize_t count
+        object items
+        WriteBuffer item_buf = WriteBuffer.new()
+
+    count = len(obj)
+    if count > _MAXINT32:
+        raise ValueError('hstore value is too large')
+    item_buf.write_int32(<int32_t>count)
+
+    if hasattr(obj, 'items'):
+        items = obj.items()
+    else:
+        items = obj
+
+    for k, v in items:
+        if k is None:
+            raise ValueError('null value not allowed in hstore key')
+        as_pg_string_and_size(settings, k, &str, &size)
+        item_buf.write_int32(<int32_t>size)
+        item_buf.write_cstr(str, size)
+        if v is None:
+            item_buf.write_int32(<int32_t>-1)
+        else:
+            as_pg_string_and_size(settings, v, &str, &size)
+            item_buf.write_int32(<int32_t>size)
+            item_buf.write_cstr(str, size)
+
+    buf.write_int32(item_buf.len())
+    buf.write_buffer(item_buf)
+
+
+cdef hstore_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        dict result
+        uint32_t elem_count
+        int32_t elem_len
+        uint32_t i
+        str k
+        str v
+
+    result = {}
+
+    elem_count = <uint32_t>hton.unpack_int32(frb_read(buf, 4))
+    if elem_count == 0:
+        return result
+
+    for i in range(elem_count):
+        elem_len = hton.unpack_int32(frb_read(buf, 4))
+        if elem_len < 0:
+            raise ValueError('null value not allowed in hstore key')
+
+        k = decode_pg_string(settings, frb_read(buf, elem_len), elem_len)
+
+        elem_len = hton.unpack_int32(frb_read(buf, 4))
+        if elem_len < 0:
+            v = None
+        else:
+            v = decode_pg_string(settings, frb_read(buf, elem_len), elem_len)
+
+        result[k] = v
+
+    return result

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/int.pyx

@@ -0,0 +1,144 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef bool_encode(CodecContext settings, WriteBuffer buf, obj):
+    if not cpython.PyBool_Check(obj):
+        raise TypeError('a boolean is required (got type {})'.format(
+            type(obj).__name__))
+
+    buf.write_int32(1)
+    buf.write_byte(b'\x01' if obj is True else b'\x00')
+
+
+cdef bool_decode(CodecContext settings, FRBuffer *buf):
+    return frb_read(buf, 1)[0] is b'\x01'
+
+
+cdef int2_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef int overflow = 0
+    cdef long val
+
+    try:
+        if type(obj) is not int and hasattr(type(obj), '__int__'):
+            # Silence a Python warning about implicit __int__
+            # conversion.
+            obj = int(obj)
+        val = cpython.PyLong_AsLong(obj)
+    except OverflowError:
+        overflow = 1
+
+    if overflow or val < INT16_MIN or val > INT16_MAX:
+        raise OverflowError('value out of int16 range')
+
+    buf.write_int32(2)
+    buf.write_int16(<int16_t>val)
+
+
+cdef int2_decode(CodecContext settings, FRBuffer *buf):
+    return cpython.PyLong_FromLong(hton.unpack_int16(frb_read(buf, 2)))
+
+
+cdef int4_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef int overflow = 0
+    cdef long val = 0
+
+    try:
+        if type(obj) is not int and hasattr(type(obj), '__int__'):
+            # Silence a Python warning about implicit __int__
+            # conversion.
+            obj = int(obj)
+        val = cpython.PyLong_AsLong(obj)
+    except OverflowError:
+        overflow = 1
+
+    # "long" and "long long" have the same size for x86_64, need an extra check
+    if overflow or (sizeof(val) > 4 and (val < INT32_MIN or val > INT32_MAX)):
+        raise OverflowError('value out of int32 range')
+
+    buf.write_int32(4)
+    buf.write_int32(<int32_t>val)
+
+
+cdef int4_decode(CodecContext settings, FRBuffer *buf):
+    return cpython.PyLong_FromLong(hton.unpack_int32(frb_read(buf, 4)))
+
+
+cdef uint4_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef int overflow = 0
+    cdef unsigned long val = 0
+
+    try:
+        if type(obj) is not int and hasattr(type(obj), '__int__'):
+            # Silence a Python warning about implicit __int__
+            # conversion.
+            obj = int(obj)
+        val = cpython.PyLong_AsUnsignedLong(obj)
+    except OverflowError:
+        overflow = 1
+
+    # "long" and "long long" have the same size for x86_64, need an extra check
+    if overflow or (sizeof(val) > 4 and val > UINT32_MAX):
+        raise OverflowError('value out of uint32 range')
+
+    buf.write_int32(4)
+    buf.write_int32(<int32_t>val)
+
+
+cdef uint4_decode(CodecContext settings, FRBuffer *buf):
+    return cpython.PyLong_FromUnsignedLong(
+        <uint32_t>hton.unpack_int32(frb_read(buf, 4)))
+
+
+cdef int8_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef int overflow = 0
+    cdef long long val
+
+    try:
+        if type(obj) is not int and hasattr(type(obj), '__int__'):
+            # Silence a Python warning about implicit __int__
+            # conversion.
+            obj = int(obj)
+        val = cpython.PyLong_AsLongLong(obj)
+    except OverflowError:
+        overflow = 1
+
+    # Just in case for systems with "long long" bigger than 8 bytes
+    if overflow or (sizeof(val) > 8 and (val < INT64_MIN or val > INT64_MAX)):
+        raise OverflowError('value out of int64 range')
+
+    buf.write_int32(8)
+    buf.write_int64(<int64_t>val)
+
+
+cdef int8_decode(CodecContext settings, FRBuffer *buf):
+    return cpython.PyLong_FromLongLong(hton.unpack_int64(frb_read(buf, 8)))
+
+
+cdef uint8_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef int overflow = 0
+    cdef unsigned long long val = 0
+
+    try:
+        if type(obj) is not int and hasattr(type(obj), '__int__'):
+            # Silence a Python warning about implicit __int__
+            # conversion.
+            obj = int(obj)
+        val = cpython.PyLong_AsUnsignedLongLong(obj)
+    except OverflowError:
+        overflow = 1
+
+    # Just in case for systems with "long long" bigger than 8 bytes
+    if overflow or (sizeof(val) > 8 and val > UINT64_MAX):
+        raise OverflowError('value out of uint64 range')
+
+    buf.write_int32(8)
+    buf.write_int64(<int64_t>val)
+
+
+cdef uint8_decode(CodecContext settings, FRBuffer *buf):
+    return cpython.PyLong_FromUnsignedLongLong(
+        <uint64_t>hton.unpack_int64(frb_read(buf, 8)))

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/json.pyx

@@ -0,0 +1,57 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef jsonb_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        char *str
+        ssize_t size
+
+    if settings.is_encoding_json():
+        obj = settings.get_json_encoder().encode(obj)
+
+    as_pg_string_and_size(settings, obj, &str, &size)
+
+    if size > 0x7fffffff - 1:
+        raise ValueError('string too long')
+
+    buf.write_int32(<int32_t>size + 1)
+    buf.write_byte(1)  # JSONB format version
+    buf.write_cstr(str, size)
+
+
+cdef jsonb_decode(CodecContext settings, FRBuffer *buf):
+    cdef uint8_t format = <uint8_t>(frb_read(buf, 1)[0])
+
+    if format != 1:
+        raise ValueError('unexpected JSONB format: {}'.format(format))
+
+    rv = text_decode(settings, buf)
+
+    if settings.is_decoding_json():
+        rv = settings.get_json_decoder().decode(rv)
+
+    return rv
+
+
+cdef json_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        char *str
+        ssize_t size
+
+    if settings.is_encoding_json():
+        obj = settings.get_json_encoder().encode(obj)
+
+    text_encode(settings, buf, obj)
+
+
+cdef json_decode(CodecContext settings, FRBuffer *buf):
+    rv = text_decode(settings, buf)
+
+    if settings.is_decoding_json():
+        rv = settings.get_json_decoder().decode(rv)
+
+    return rv

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/jsonpath.pyx

@@ -0,0 +1,29 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef jsonpath_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        char *str
+        ssize_t size
+
+    as_pg_string_and_size(settings, obj, &str, &size)
+
+    if size > 0x7fffffff - 1:
+        raise ValueError('string too long')
+
+    buf.write_int32(<int32_t>size + 1)
+    buf.write_byte(1)  # jsonpath format version
+    buf.write_cstr(str, size)
+
+
+cdef jsonpath_decode(CodecContext settings, FRBuffer *buf):
+    cdef uint8_t format = <uint8_t>(frb_read(buf, 1)[0])
+
+    if format != 1:
+        raise ValueError('unexpected jsonpath format: {}'.format(format))
+
+    return text_decode(settings, buf)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/misc.pyx

@@ -0,0 +1,16 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef void_encode(CodecContext settings, WriteBuffer buf, obj):
+    # Void is zero bytes
+    buf.write_int32(0)
+
+
+cdef void_decode(CodecContext settings, FRBuffer *buf):
+    # Do nothing; void will be passed as NULL so this function
+    # will never be called.
+    pass

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/network.pyx

@@ -0,0 +1,139 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import ipaddress
+
+
+# defined in postgresql/src/include/inet.h
+#
+DEF PGSQL_AF_INET = 2  # AF_INET
+DEF PGSQL_AF_INET6 = 3  # AF_INET + 1
+
+
+_ipaddr = ipaddress.ip_address
+_ipiface = ipaddress.ip_interface
+_ipnet = ipaddress.ip_network
+
+
+cdef inline uint8_t _ip_max_prefix_len(int32_t family):
+    # Maximum number of bits in the network prefix of the specified
+    # IP protocol version.
+    if family == PGSQL_AF_INET:
+        return 32
+    else:
+        return 128
+
+
+cdef inline int32_t _ip_addr_len(int32_t family):
+    # Length of address in bytes for the specified IP protocol version.
+    if family == PGSQL_AF_INET:
+        return 4
+    else:
+        return 16
+
+
+cdef inline int8_t _ver_to_family(int32_t version):
+    if version == 4:
+        return PGSQL_AF_INET
+    else:
+        return PGSQL_AF_INET6
+
+
+cdef inline _net_encode(WriteBuffer buf, int8_t family, uint32_t bits,
+                        int8_t is_cidr, bytes addr):
+
+    cdef:
+        char *addrbytes
+        ssize_t addrlen
+
+    cpython.PyBytes_AsStringAndSize(addr, &addrbytes, &addrlen)
+
+    buf.write_int32(4 + <int32_t>addrlen)
+    buf.write_byte(family)
+    buf.write_byte(<int8_t>bits)
+    buf.write_byte(is_cidr)
+    buf.write_byte(<int8_t>addrlen)
+    buf.write_cstr(addrbytes, addrlen)
+
+
+cdef net_decode(CodecContext settings, FRBuffer *buf, bint as_cidr):
+    cdef:
+        int32_t family = <int32_t>frb_read(buf, 1)[0]
+        uint8_t bits = <uint8_t>frb_read(buf, 1)[0]
+        int prefix_len
+        int32_t is_cidr = <int32_t>frb_read(buf, 1)[0]
+        int32_t addrlen = <int32_t>frb_read(buf, 1)[0]
+        bytes addr
+        uint8_t max_prefix_len = _ip_max_prefix_len(family)
+
+    if is_cidr != as_cidr:
+        raise ValueError('unexpected CIDR flag set in non-cidr value')
+
+    if family != PGSQL_AF_INET and family != PGSQL_AF_INET6:
+        raise ValueError('invalid address family in "{}" value'.format(
+            'cidr' if is_cidr else 'inet'
+        ))
+
+    max_prefix_len = _ip_max_prefix_len(family)
+
+    if bits > max_prefix_len:
+        raise ValueError('invalid network prefix length in "{}" value'.format(
+            'cidr' if is_cidr else 'inet'
+        ))
+
+    if addrlen != _ip_addr_len(family):
+        raise ValueError('invalid address length in "{}" value'.format(
+            'cidr' if is_cidr else 'inet'
+        ))
+
+    addr = cpython.PyBytes_FromStringAndSize(frb_read(buf, addrlen), addrlen)
+
+    if as_cidr or bits != max_prefix_len:
+        prefix_len = cpython.PyLong_FromLong(bits)
+
+        if as_cidr:
+            return _ipnet((addr, prefix_len))
+        else:
+            return _ipiface((addr, prefix_len))
+    else:
+        return _ipaddr(addr)
+
+
+cdef cidr_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        object ipnet
+        int8_t family
+
+    ipnet = _ipnet(obj)
+    family = _ver_to_family(ipnet.version)
+    _net_encode(buf, family, ipnet.prefixlen, 1, ipnet.network_address.packed)
+
+
+cdef cidr_decode(CodecContext settings, FRBuffer *buf):
+    return net_decode(settings, buf, True)
+
+
+cdef inet_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        object ipaddr
+        int8_t family
+
+    try:
+        ipaddr = _ipaddr(obj)
+    except ValueError:
+        # PostgreSQL accepts *both* CIDR and host values
+        # for the host datatype.
+        ipaddr = _ipiface(obj)
+        family = _ver_to_family(ipaddr.version)
+        _net_encode(buf, family, ipaddr.network.prefixlen, 1, ipaddr.packed)
+    else:
+        family = _ver_to_family(ipaddr.version)
+        _net_encode(buf, family, _ip_max_prefix_len(family), 0, ipaddr.packed)
+
+
+cdef inet_decode(CodecContext settings, FRBuffer *buf):
+    return net_decode(settings, buf, False)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/numeric.pyx

@@ -0,0 +1,356 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from libc.math cimport abs, log10
+from libc.stdio cimport snprintf
+
+import decimal
+
+# defined in postgresql/src/backend/utils/adt/numeric.c
+DEF DEC_DIGITS = 4
+DEF MAX_DSCALE = 0x3FFF
+DEF NUMERIC_POS = 0x0000
+DEF NUMERIC_NEG = 0x4000
+DEF NUMERIC_NAN = 0xC000
+DEF NUMERIC_PINF = 0xD000
+DEF NUMERIC_NINF = 0xF000
+
+_Dec = decimal.Decimal
+
+
+cdef numeric_encode_text(CodecContext settings, WriteBuffer buf, obj):
+    text_encode(settings, buf, str(obj))
+
+
+cdef numeric_decode_text(CodecContext settings, FRBuffer *buf):
+    return _Dec(text_decode(settings, buf))
+
+
+cdef numeric_encode_binary(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        object dec
+        object dt
+        int64_t exponent
+        int64_t i
+        int64_t j
+        tuple pydigits
+        int64_t num_pydigits
+        int16_t pgdigit
+        int64_t num_pgdigits
+        int16_t dscale
+        int64_t dweight
+        int64_t weight
+        uint16_t sign
+        int64_t padding_size = 0
+
+    if isinstance(obj, _Dec):
+        dec = obj
+    else:
+        dec = _Dec(obj)
+
+    dt = dec.as_tuple()
+
+    if dt.exponent == 'n' or dt.exponent == 'N':
+        # NaN
+        sign = NUMERIC_NAN
+        num_pgdigits = 0
+        weight = 0
+        dscale = 0
+    elif dt.exponent == 'F':
+        # Infinity
+        if dt.sign:
+            sign = NUMERIC_NINF
+        else:
+            sign = NUMERIC_PINF
+        num_pgdigits = 0
+        weight = 0
+        dscale = 0
+    else:
+        exponent = dt.exponent
+        if exponent < 0 and -exponent > MAX_DSCALE:
+            raise ValueError(
+                'cannot encode Decimal value into numeric: '
+                'exponent is too small')
+
+        if dt.sign:
+            sign = NUMERIC_NEG
+        else:
+            sign = NUMERIC_POS
+
+        pydigits = dt.digits
+        num_pydigits = len(pydigits)
+
+        dweight = num_pydigits + exponent - 1
+        if dweight >= 0:
+            weight = (dweight + DEC_DIGITS) // DEC_DIGITS - 1
+        else:
+            weight = -((-dweight - 1) // DEC_DIGITS + 1)
+
+        if weight > 2 ** 16 - 1:
+            raise ValueError(
+                    'cannot encode Decimal value into numeric: '
+                    'exponent is too large')
+
+        padding_size = \
+            (weight + 1) * DEC_DIGITS - (dweight + 1)
+        num_pgdigits = \
+            (num_pydigits + padding_size + DEC_DIGITS - 1) // DEC_DIGITS
+
+        if num_pgdigits > 2 ** 16 - 1:
+            raise ValueError(
+                    'cannot encode Decimal value into numeric: '
+                    'number of digits is too large')
+
+        # Pad decimal digits to provide room for correct Postgres
+        # digit alignment in the digit computation loop.
+        pydigits = (0,) * DEC_DIGITS + pydigits + (0,) * DEC_DIGITS
+
+        if exponent < 0:
+            if -exponent > MAX_DSCALE:
+                raise ValueError(
+                    'cannot encode Decimal value into numeric: '
+                    'exponent is too small')
+            dscale = <int16_t>-exponent
+        else:
+            dscale = 0
+
+    buf.write_int32(2 + 2 + 2 + 2 + 2 * <uint16_t>num_pgdigits)
+    buf.write_int16(<int16_t>num_pgdigits)
+    buf.write_int16(<int16_t>weight)
+    buf.write_int16(<int16_t>sign)
+    buf.write_int16(dscale)
+
+    j = DEC_DIGITS - padding_size
+
+    for i in range(num_pgdigits):
+        pgdigit = (pydigits[j] * 1000 + pydigits[j + 1] * 100 +
+                   pydigits[j + 2] * 10 + pydigits[j + 3])
+        j += DEC_DIGITS
+        buf.write_int16(pgdigit)
+
+
+# The decoding strategy here is to form a string representation of
+# the numeric var, as it is faster than passing an iterable of digits.
+# For this reason the below code is pure overhead and is ~25% slower
+# than the simple text decoder above.  That said, we need the binary
+# decoder to support binary COPY with numeric values.
+cdef numeric_decode_binary_ex(
+    CodecContext settings,
+    FRBuffer *buf,
+    bint trail_fract_zero,
+):
+    cdef:
+        uint16_t num_pgdigits = <uint16_t>hton.unpack_int16(frb_read(buf, 2))
+        int16_t weight = hton.unpack_int16(frb_read(buf, 2))
+        uint16_t sign = <uint16_t>hton.unpack_int16(frb_read(buf, 2))
+        uint16_t dscale = <uint16_t>hton.unpack_int16(frb_read(buf, 2))
+        int16_t pgdigit0
+        ssize_t i
+        int16_t pgdigit
+        object pydigits
+        ssize_t num_pydigits
+        ssize_t actual_num_pydigits
+        ssize_t buf_size
+        int64_t exponent
+        int64_t abs_exponent
+        ssize_t exponent_chars
+        ssize_t front_padding = 0
+        ssize_t num_fract_digits
+        ssize_t trailing_fract_zeros_adj
+        char smallbuf[_NUMERIC_DECODER_SMALLBUF_SIZE]
+        char *charbuf
+        char *bufptr
+        bint buf_allocated = False
+
+    if sign == NUMERIC_NAN:
+        # Not-a-number
+        return _Dec('NaN')
+    elif sign == NUMERIC_PINF:
+        # +Infinity
+        return _Dec('Infinity')
+    elif sign == NUMERIC_NINF:
+        # -Infinity
+        return _Dec('-Infinity')
+
+    if num_pgdigits == 0:
+        # Zero
+        return _Dec('0e-' + str(dscale))
+
+    pgdigit0 = hton.unpack_int16(frb_read(buf, 2))
+    if weight >= 0:
+        if pgdigit0 < 10:
+            front_padding = 3
+        elif pgdigit0 < 100:
+            front_padding = 2
+        elif pgdigit0 < 1000:
+            front_padding = 1
+
+    # The number of fractional decimal digits actually encoded in
+    # base-DEC_DEIGITS digits sent by Postgres.
+    num_fract_digits = (num_pgdigits - weight - 1) * DEC_DIGITS
+
+    # The trailing zero adjustment necessary to obtain exactly
+    # dscale number of fractional digits in output.  May be negative,
+    # which indicates that trailing zeros in the last input digit
+    # should be discarded.
+    trailing_fract_zeros_adj = dscale - num_fract_digits
+
+    # Maximum possible number of decimal digits in base 10.
+    # The actual number might be up to 3 digits smaller due to
+    # leading zeros in first input digit.
+    num_pydigits = num_pgdigits * DEC_DIGITS
+    if trailing_fract_zeros_adj > 0:
+        num_pydigits += trailing_fract_zeros_adj
+
+    # Exponent.
+    exponent = (weight + 1) * DEC_DIGITS - front_padding
+    abs_exponent = abs(exponent)
+    if abs_exponent != 0:
+        # Number of characters required to render absolute exponent value
+        # in decimal.
+        exponent_chars = <ssize_t>log10(<double>abs_exponent) + 1
+    else:
+        exponent_chars = 0
+
+    # Output buffer size.
+    buf_size = (
+        1 +                 # sign
+        1 +                 # leading zero
+        1 +                 # decimal dot
+        num_pydigits +      # digits
+        1 +                 # possible trailing zero padding
+        2 +                 # exponent indicator (E-,E+)
+        exponent_chars +    # exponent
+        1                   # null terminator char
+    )
+
+    if buf_size > _NUMERIC_DECODER_SMALLBUF_SIZE:
+        charbuf = <char *>cpython.PyMem_Malloc(<size_t>buf_size)
+        buf_allocated = True
+    else:
+        charbuf = smallbuf
+
+    try:
+        bufptr = charbuf
+
+        if sign == NUMERIC_NEG:
+            bufptr[0] = b'-'
+            bufptr += 1
+
+        bufptr[0] = b'0'
+        bufptr[1] = b'.'
+        bufptr += 2
+
+        if weight >= 0:
+            bufptr = _unpack_digit_stripping_lzeros(bufptr, pgdigit0)
+        else:
+            bufptr = _unpack_digit(bufptr, pgdigit0)
+
+        for i in range(1, num_pgdigits):
+            pgdigit = hton.unpack_int16(frb_read(buf, 2))
+            bufptr = _unpack_digit(bufptr, pgdigit)
+
+        if dscale:
+            if trailing_fract_zeros_adj > 0:
+                for i in range(trailing_fract_zeros_adj):
+                    bufptr[i] = <char>b'0'
+
+            # If display scale is _less_ than the number of rendered digits,
+            # trailing_fract_zeros_adj will be negative and this will strip
+            # the excess trailing zeros.
+            bufptr += trailing_fract_zeros_adj
+
+        if trail_fract_zero:
+            # Check if the number of rendered digits matches the exponent,
+            # and if so, add another trailing zero, so the result always
+            # appears with a decimal point.
+            actual_num_pydigits = bufptr - charbuf - 2
+            if sign == NUMERIC_NEG:
+                actual_num_pydigits -= 1
+
+            if actual_num_pydigits == abs_exponent:
+                bufptr[0] = <char>b'0'
+                bufptr += 1
+
+        if exponent != 0:
+            bufptr[0] = b'E'
+            if exponent < 0:
+                bufptr[1] = b'-'
+            else:
+                bufptr[1] = b'+'
+            bufptr += 2
+            snprintf(bufptr, <size_t>exponent_chars + 1, '%d',
+                     <int>abs_exponent)
+            bufptr += exponent_chars
+
+        bufptr[0] = 0
+
+        pydigits = cpythonx.PyUnicode_FromString(charbuf)
+
+        return _Dec(pydigits)
+
+    finally:
+        if buf_allocated:
+            cpython.PyMem_Free(charbuf)
+
+
+cdef numeric_decode_binary(CodecContext settings, FRBuffer *buf):
+    return numeric_decode_binary_ex(settings, buf, False)
+
+
+cdef inline char *_unpack_digit_stripping_lzeros(char *buf, int64_t pgdigit):
+    cdef:
+        int64_t d
+        bint significant
+
+    d = pgdigit // 1000
+    significant = (d > 0)
+    if significant:
+        pgdigit -= d * 1000
+        buf[0] = <char>(d + <int32_t>b'0')
+        buf += 1
+
+    d = pgdigit // 100
+    significant |= (d > 0)
+    if significant:
+        pgdigit -= d * 100
+        buf[0] = <char>(d + <int32_t>b'0')
+        buf += 1
+
+    d = pgdigit // 10
+    significant |= (d > 0)
+    if significant:
+        pgdigit -= d * 10
+        buf[0] = <char>(d + <int32_t>b'0')
+        buf += 1
+
+    buf[0] = <char>(pgdigit + <int32_t>b'0')
+    buf += 1
+
+    return buf
+
+
+cdef inline char *_unpack_digit(char *buf, int64_t pgdigit):
+    cdef:
+        int64_t d
+
+    d = pgdigit // 1000
+    pgdigit -= d * 1000
+    buf[0] = <char>(d + <int32_t>b'0')
+
+    d = pgdigit // 100
+    pgdigit -= d * 100
+    buf[1] = <char>(d + <int32_t>b'0')
+
+    d = pgdigit // 10
+    pgdigit -= d * 10
+    buf[2] = <char>(d + <int32_t>b'0')
+
+    buf[3] = <char>(pgdigit + <int32_t>b'0')
+    buf += 4
+
+    return buf

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/pg_snapshot.pyx

@@ -0,0 +1,63 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef pg_snapshot_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        ssize_t nxip
+        uint64_t xmin
+        uint64_t xmax
+        int i
+        WriteBuffer xip_buf = WriteBuffer.new()
+
+    if not (cpython.PyTuple_Check(obj) or cpython.PyList_Check(obj)):
+        raise TypeError(
+            'list or tuple expected (got type {})'.format(type(obj)))
+
+    if len(obj) != 3:
+        raise ValueError(
+            'invalid number of elements in txid_snapshot tuple, expecting 4')
+
+    nxip = len(obj[2])
+    if nxip > _MAXINT32:
+        raise ValueError('txid_snapshot value is too long')
+
+    xmin = obj[0]
+    xmax = obj[1]
+
+    for i in range(nxip):
+        xip_buf.write_int64(
+            <int64_t>cpython.PyLong_AsUnsignedLongLong(obj[2][i]))
+
+    buf.write_int32(20 + xip_buf.len())
+
+    buf.write_int32(<int32_t>nxip)
+    buf.write_int64(<int64_t>xmin)
+    buf.write_int64(<int64_t>xmax)
+    buf.write_buffer(xip_buf)
+
+
+cdef pg_snapshot_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        int32_t nxip
+        uint64_t xmin
+        uint64_t xmax
+        tuple xip_tup
+        int32_t i
+        object xip
+
+    nxip = hton.unpack_int32(frb_read(buf, 4))
+    xmin = <uint64_t>hton.unpack_int64(frb_read(buf, 8))
+    xmax = <uint64_t>hton.unpack_int64(frb_read(buf, 8))
+
+    xip_tup = cpython.PyTuple_New(nxip)
+    for i in range(nxip):
+        xip = cpython.PyLong_FromUnsignedLongLong(
+            <uint64_t>hton.unpack_int64(frb_read(buf, 8)))
+        cpython.Py_INCREF(xip)
+        cpython.PyTuple_SET_ITEM(xip_tup, i, xip)
+
+    return (xmin, xmax, xip_tup)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/text.pyx

@@ -0,0 +1,48 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef inline as_pg_string_and_size(
+        CodecContext settings, obj, char **cstr, ssize_t *size):
+
+    if not cpython.PyUnicode_Check(obj):
+        raise TypeError('expected str, got {}'.format(type(obj).__name__))
+
+    if settings.is_encoding_utf8():
+        cstr[0] = <char*>cpythonx.PyUnicode_AsUTF8AndSize(obj, size)
+    else:
+        encoded = settings.get_text_codec().encode(obj)[0]
+        cpython.PyBytes_AsStringAndSize(encoded, cstr, size)
+
+    if size[0] > 0x7fffffff:
+        raise ValueError('string too long')
+
+
+cdef text_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef:
+        char *str
+        ssize_t size
+
+    as_pg_string_and_size(settings, obj, &str, &size)
+
+    buf.write_int32(<int32_t>size)
+    buf.write_cstr(str, size)
+
+
+cdef inline decode_pg_string(CodecContext settings, const char* data,
+                             ssize_t len):
+
+    if settings.is_encoding_utf8():
+        # decode UTF-8 in strict mode
+        return cpython.PyUnicode_DecodeUTF8(data, len, NULL)
+    else:
+        bytes = cpython.PyBytes_FromStringAndSize(data, len)
+        return settings.get_text_codec().decode(bytes)[0]
+
+
+cdef text_decode(CodecContext settings, FRBuffer *buf):
+    cdef ssize_t buf_len = buf.len
+    return decode_pg_string(settings, frb_read_all(buf), buf_len)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/tid.pyx

@@ -0,0 +1,51 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef tid_encode(CodecContext settings, WriteBuffer buf, obj):
+    cdef int overflow = 0
+    cdef unsigned long block, offset
+
+    if not (cpython.PyTuple_Check(obj) or cpython.PyList_Check(obj)):
+        raise TypeError(
+            'list or tuple expected (got type {})'.format(type(obj)))
+
+    if len(obj) != 2:
+        raise ValueError(
+            'invalid number of elements in tid tuple, expecting 2')
+
+    try:
+        block = cpython.PyLong_AsUnsignedLong(obj[0])
+    except OverflowError:
+        overflow = 1
+
+    # "long" and "long long" have the same size for x86_64, need an extra check
+    if overflow or (sizeof(block) > 4 and block > UINT32_MAX):
+        raise OverflowError('tuple id block value out of uint32 range')
+
+    try:
+        offset = cpython.PyLong_AsUnsignedLong(obj[1])
+        overflow = 0
+    except OverflowError:
+        overflow = 1
+
+    if overflow or offset > 65535:
+        raise OverflowError('tuple id offset value out of uint16 range')
+
+    buf.write_int32(6)
+    buf.write_int32(<int32_t>block)
+    buf.write_int16(<int16_t>offset)
+
+
+cdef tid_decode(CodecContext settings, FRBuffer *buf):
+    cdef:
+        uint32_t block
+        uint16_t offset
+
+    block = <uint32_t>hton.unpack_int32(frb_read(buf, 4))
+    offset = <uint16_t>hton.unpack_int16(frb_read(buf, 2))
+
+    return (block, offset)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/codecs/uuid.pyx

@@ -0,0 +1,27 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef uuid_encode(CodecContext settings, WriteBuffer wbuf, obj):
+    cdef:
+        char buf[16]
+
+    if type(obj) is pg_UUID:
+        wbuf.write_int32(<int32_t>16)
+        wbuf.write_cstr((<UUID>obj)._data, 16)
+    elif cpython.PyUnicode_Check(obj):
+        pg_uuid_bytes_from_str(obj, buf)
+        wbuf.write_int32(<int32_t>16)
+        wbuf.write_cstr(buf, 16)
+    else:
+        bytea_encode(settings, wbuf, obj.bytes)
+
+
+cdef uuid_decode(CodecContext settings, FRBuffer *buf):
+    if buf.len != 16:
+        raise TypeError(
+            f'cannot decode UUID, expected 16 bytes, got {buf.len}')
+    return pg_uuid_from_buf(frb_read_all(buf))

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/consts.pxi

@@ -0,0 +1,9 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+DEF _MAXINT32 = 2**31 - 1
+DEF _NUMERIC_DECODER_SMALLBUF_SIZE = 256

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/cpythonx.pxd

@@ -0,0 +1,23 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from cpython cimport Py_buffer
+
+cdef extern from "Python.h":
+    int PyUnicode_1BYTE_KIND
+
+    int PyByteArray_CheckExact(object)
+    int PyByteArray_Resize(object, ssize_t) except -1
+    object PyByteArray_FromStringAndSize(const char *, ssize_t)
+    char* PyByteArray_AsString(object)
+
+    object PyUnicode_FromString(const char *u)
+    const char* PyUnicode_AsUTF8AndSize(
+        object unicode, ssize_t *size) except NULL
+
+    object PyUnicode_FromKindAndData(
+        int kind, const void *buffer, Py_ssize_t size)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/debug.pxd

@@ -0,0 +1,10 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef extern from "debug.h":
+
+	cdef int PG_DEBUG

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/frb.pxd

@@ -0,0 +1,48 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef:
+
+    struct FRBuffer:
+        const char* buf
+        ssize_t len
+
+    inline ssize_t frb_get_len(FRBuffer *frb):
+        return frb.len
+
+    inline void frb_set_len(FRBuffer *frb, ssize_t new_len):
+        frb.len = new_len
+
+    inline void frb_init(FRBuffer *frb, const char *buf, ssize_t len):
+        frb.buf = buf
+        frb.len = len
+
+    inline const char* frb_read(FRBuffer *frb, ssize_t n) except NULL:
+        cdef const char *result
+
+        frb_check(frb, n)
+
+        result = frb.buf
+        frb.buf += n
+        frb.len -= n
+
+        return result
+
+    inline const char* frb_read_all(FRBuffer *frb):
+        cdef const char *result
+        result = frb.buf
+        frb.buf += frb.len
+        frb.len = 0
+        return result
+
+    inline FRBuffer *frb_slice_from(FRBuffer *frb,
+                                    FRBuffer* source, ssize_t len):
+        frb.buf = frb_read(source, len)
+        frb.len = len
+        return frb
+
+    object frb_check(FRBuffer *frb, ssize_t n)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/frb.pyx

@@ -0,0 +1,12 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef object frb_check(FRBuffer *frb, ssize_t n):
+    if n > frb.len:
+        raise AssertionError(
+            f'insufficient data in buffer: requested {n} '
+            f'remaining {frb.len}')

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/hton.pxd

@@ -0,0 +1,24 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from libc.stdint cimport int16_t, int32_t, uint16_t, uint32_t, int64_t, uint64_t
+
+
+cdef extern from "./hton.h":
+    cdef void pack_int16(char *buf, int16_t x);
+    cdef void pack_int32(char *buf, int32_t x);
+    cdef void pack_int64(char *buf, int64_t x);
+    cdef void pack_float(char *buf, float f);
+    cdef void pack_double(char *buf, double f);
+    cdef int16_t unpack_int16(const char *buf);
+    cdef uint16_t unpack_uint16(const char *buf);
+    cdef int32_t unpack_int32(const char *buf);
+    cdef uint32_t unpack_uint32(const char *buf);
+    cdef int64_t unpack_int64(const char *buf);
+    cdef uint64_t unpack_uint64(const char *buf);
+    cdef float unpack_float(const char *buf);
+    cdef double unpack_double(const char *buf);

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/pgproto.pxd

@@ -0,0 +1,19 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cimport cython
+cimport cpython
+
+from libc.stdint cimport int16_t, int32_t, uint16_t, uint32_t, int64_t, uint64_t
+
+
+include "./consts.pxi"
+include "./frb.pxd"
+include "./buffer.pxd"
+
+
+include "./codecs/__init__.pxd"

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/pgproto.pyi

@@ -0,0 +1,20 @@
+import codecs
+import typing
+import uuid
+
+class CodecContext:
+    def get_text_codec(self) -> codecs.CodecInfo: ...
+    def get_json_decoder(self) -> object: ...
+    def get_json_encoder(self) -> object: ...
+
+@typing.final
+class ReadBuffer: ...
+
+@typing.final
+class WriteBuffer: ...
+
+class BufferError(Exception): ...
+
+@typing.final
+class UUID(uuid.UUID):
+    def __init__(self, inp: typing.AnyStr) -> None: ...

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/pgproto.pyx

@@ -0,0 +1,49 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cimport cython
+cimport cpython
+
+from . cimport cpythonx
+
+from libc.stdint cimport int8_t, uint8_t, int16_t, uint16_t, \
+                         int32_t, uint32_t, int64_t, uint64_t, \
+                         INT16_MIN, INT16_MAX, INT32_MIN, INT32_MAX, \
+                         UINT32_MAX, INT64_MIN, INT64_MAX, UINT64_MAX
+
+
+from . cimport hton
+from . cimport tohex
+
+from .debug cimport PG_DEBUG
+from . import types as pgproto_types
+
+
+include "./consts.pxi"
+include "./frb.pyx"
+include "./buffer.pyx"
+include "./uuid.pyx"
+
+include "./codecs/context.pyx"
+
+include "./codecs/bytea.pyx"
+include "./codecs/text.pyx"
+
+include "./codecs/datetime.pyx"
+include "./codecs/float.pyx"
+include "./codecs/int.pyx"
+include "./codecs/json.pyx"
+include "./codecs/jsonpath.pyx"
+include "./codecs/uuid.pyx"
+include "./codecs/numeric.pyx"
+include "./codecs/bits.pyx"
+include "./codecs/geometry.pyx"
+include "./codecs/hstore.pyx"
+include "./codecs/misc.pyx"
+include "./codecs/network.pyx"
+include "./codecs/tid.pyx"
+include "./codecs/pg_snapshot.pyx"

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/tohex.pxd

@@ -0,0 +1,10 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef extern from "./tohex.h":
+    cdef void uuid_to_str(const char *source, char *dest)
+    cdef void uuid_to_hex(const char *source, char *dest)

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/types.py

@@ -0,0 +1,435 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+from __future__ import annotations
+
+import typing
+
+if typing.TYPE_CHECKING:
+    import builtins
+    import sys
+
+    if sys.version_info < (3, 11):
+        from typing_extensions import Self
+    else:
+        from typing import Self
+
+
+__all__ = (
+    'BitString', 'Point', 'Path', 'Polygon',
+    'Box', 'Line', 'LineSegment', 'Circle',
+)
+
+_BitOrderType = typing.Literal['big', 'little']
+
+
+class BitString:
+    """Immutable representation of PostgreSQL `bit` and `varbit` types."""
+
+    __slots__ = '_bytes', '_bitlength'
+
+    _bytes: bytes
+    _bitlength: int
+
+    def __init__(self,
+                 bitstring: builtins.bytes | None = None) -> None:
+        if not bitstring:
+            self._bytes = bytes()
+            self._bitlength = 0
+        else:
+            bytelen = len(bitstring) // 8 + 1
+            bytes_ = bytearray(bytelen)
+            byte = 0
+            byte_pos = 0
+            bit_pos = 0
+
+            for i, bit in enumerate(bitstring):
+                if bit == ' ':  # type: ignore
+                    continue
+                bit = int(bit)
+                if bit != 0 and bit != 1:
+                    raise ValueError(
+                        'invalid bit value at position {}'.format(i))
+
+                byte |= bit << (8 - bit_pos - 1)
+                bit_pos += 1
+                if bit_pos == 8:
+                    bytes_[byte_pos] = byte
+                    byte = 0
+                    byte_pos += 1
+                    bit_pos = 0
+
+            if bit_pos != 0:
+                bytes_[byte_pos] = byte
+
+            bitlen = byte_pos * 8 + bit_pos
+            bytelen = byte_pos + (1 if bit_pos else 0)
+
+            self._bytes = bytes(bytes_[:bytelen])
+            self._bitlength = bitlen
+
+    @classmethod
+    def frombytes(cls,
+                  bytes_: builtins.bytes | None = None,
+                  bitlength: int | None = None) -> Self:
+        if bitlength is None:
+            if bytes_ is None:
+                bytes_ = bytes()
+                bitlength = 0
+            else:
+                bitlength = len(bytes_) * 8
+        else:
+            if bytes_ is None:
+                bytes_ = bytes(bitlength // 8 + 1)
+                bitlength = bitlength
+            else:
+                bytes_len = len(bytes_) * 8
+
+                if bytes_len == 0 and bitlength != 0:
+                    raise ValueError('invalid bit length specified')
+
+                if bytes_len != 0 and bitlength == 0:
+                    raise ValueError('invalid bit length specified')
+
+                if bitlength < bytes_len - 8:
+                    raise ValueError('invalid bit length specified')
+
+                if bitlength > bytes_len:
+                    raise ValueError('invalid bit length specified')
+
+        result = cls()
+        result._bytes = bytes_
+        result._bitlength = bitlength
+
+        return result
+
+    @property
+    def bytes(self) -> builtins.bytes:
+        return self._bytes
+
+    def as_string(self) -> str:
+        s = ''
+
+        for i in range(self._bitlength):
+            s += str(self._getitem(i))
+            if i % 4 == 3:
+                s += ' '
+
+        return s.strip()
+
+    def to_int(self, bitorder: _BitOrderType = 'big',
+               *, signed: bool = False) -> int:
+        """Interpret the BitString as a Python int.
+        Acts similarly to int.from_bytes.
+
+        :param bitorder:
+            Determines the bit order used to interpret the BitString. By
+            default, this function uses Postgres conventions for casting bits
+            to ints. If bitorder is 'big', the most significant bit is at the
+            start of the string (this is the same as the default). If bitorder
+            is 'little', the most significant bit is at the end of the string.
+
+        :param bool signed:
+            Determines whether two's complement is used to interpret the
+            BitString. If signed is False, the returned value is always
+            non-negative.
+
+        :return int: An integer representing the BitString. Information about
+                     the BitString's exact length is lost.
+
+        .. versionadded:: 0.18.0
+        """
+        x = int.from_bytes(self._bytes, byteorder='big')
+        x >>= -self._bitlength % 8
+        if bitorder == 'big':
+            pass
+        elif bitorder == 'little':
+            x = int(bin(x)[:1:-1].ljust(self._bitlength, '0'), 2)
+        else:
+            raise ValueError("bitorder must be either 'big' or 'little'")
+
+        if signed and self._bitlength > 0 and x & (1 << (self._bitlength - 1)):
+            x -= 1 << self._bitlength
+        return x
+
+    @classmethod
+    def from_int(cls, x: int, length: int,
+                 bitorder: _BitOrderType = 'big', *, signed: bool = False) \
+            -> Self:
+        """Represent the Python int x as a BitString.
+        Acts similarly to int.to_bytes.
+
+        :param int x:
+            An integer to represent. Negative integers are represented in two's
+            complement form, unless the argument signed is False, in which case
+            negative integers raise an OverflowError.
+
+        :param int length:
+            The length of the resulting BitString. An OverflowError is raised
+            if the integer is not representable in this many bits.
+
+        :param bitorder:
+            Determines the bit order used in the BitString representation. By
+            default, this function uses Postgres conventions for casting ints
+            to bits. If bitorder is 'big', the most significant bit is at the
+            start of the string (this is the same as the default). If bitorder
+            is 'little', the most significant bit is at the end of the string.
+
+        :param bool signed:
+            Determines whether two's complement is used in the BitString
+            representation. If signed is False and a negative integer is given,
+            an OverflowError is raised.
+
+        :return BitString: A BitString representing the input integer, in the
+                           form specified by the other input args.
+
+        .. versionadded:: 0.18.0
+        """
+        # Exception types are by analogy to int.to_bytes
+        if length < 0:
+            raise ValueError("length argument must be non-negative")
+        elif length < x.bit_length():
+            raise OverflowError("int too big to convert")
+
+        if x < 0:
+            if not signed:
+                raise OverflowError("can't convert negative int to unsigned")
+            x &= (1 << length) - 1
+
+        if bitorder == 'big':
+            pass
+        elif bitorder == 'little':
+            x = int(bin(x)[:1:-1].ljust(length, '0'), 2)
+        else:
+            raise ValueError("bitorder must be either 'big' or 'little'")
+
+        x <<= (-length % 8)
+        bytes_ = x.to_bytes((length + 7) // 8, byteorder='big')
+        return cls.frombytes(bytes_, length)
+
+    def __repr__(self) -> str:
+        return '<BitString {}>'.format(self.as_string())
+
+    __str__: typing.Callable[['BitString'], str] = __repr__
+
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, BitString):
+            return NotImplemented
+
+        return (self._bytes == other._bytes and
+                self._bitlength == other._bitlength)
+
+    def __hash__(self) -> int:
+        return hash((self._bytes, self._bitlength))
+
+    def _getitem(self, i: int) -> int:
+        byte = self._bytes[i // 8]
+        shift = 8 - i % 8 - 1
+        return (byte >> shift) & 0x1
+
+    def __getitem__(self, i: int) -> int:
+        if isinstance(i, slice):
+            raise NotImplementedError('BitString does not support slices')
+
+        if i >= self._bitlength:
+            raise IndexError('index out of range')
+
+        return self._getitem(i)
+
+    def __len__(self) -> int:
+        return self._bitlength
+
+
+class Point(typing.Tuple[float, float]):
+    """Immutable representation of PostgreSQL `point` type."""
+
+    __slots__ = ()
+
+    def __new__(
+        cls,
+        x: (
+            typing.SupportsFloat |
+            typing.SupportsIndex |
+            str |
+            builtins.bytes |
+            builtins.bytearray
+        ),
+        y: (
+            typing.SupportsFloat |
+            typing.SupportsIndex |
+            str |
+            builtins.bytes |
+            builtins.bytearray
+        )
+    ) -> Self:
+        return super().__new__(cls,
+                               typing.cast(typing.Any, (float(x), float(y))))
+
+    def __repr__(self) -> str:
+        return '{}.{}({})'.format(
+            type(self).__module__,
+            type(self).__name__,
+            tuple.__repr__(self)
+        )
+
+    @property
+    def x(self) -> float:
+        return self[0]
+
+    @property
+    def y(self) -> float:
+        return self[1]
+
+
+class Box(typing.Tuple[Point, Point]):
+    """Immutable representation of PostgreSQL `box` type."""
+
+    __slots__ = ()
+
+    def __new__(cls, high: typing.Sequence[float],
+                low: typing.Sequence[float]) -> Self:
+        return super().__new__(cls,
+                               typing.cast(typing.Any, (Point(*high),
+                                                        Point(*low))))
+
+    def __repr__(self) -> str:
+        return '{}.{}({})'.format(
+            type(self).__module__,
+            type(self).__name__,
+            tuple.__repr__(self)
+        )
+
+    @property
+    def high(self) -> Point:
+        return self[0]
+
+    @property
+    def low(self) -> Point:
+        return self[1]
+
+
+class Line(typing.Tuple[float, float, float]):
+    """Immutable representation of PostgreSQL `line` type."""
+
+    __slots__ = ()
+
+    def __new__(cls, A: float, B: float, C: float) -> Self:
+        return super().__new__(cls, typing.cast(typing.Any, (A, B, C)))
+
+    @property
+    def A(self) -> float:
+        return self[0]
+
+    @property
+    def B(self) -> float:
+        return self[1]
+
+    @property
+    def C(self) -> float:
+        return self[2]
+
+
+class LineSegment(typing.Tuple[Point, Point]):
+    """Immutable representation of PostgreSQL `lseg` type."""
+
+    __slots__ = ()
+
+    def __new__(cls, p1: typing.Sequence[float],
+                p2: typing.Sequence[float]) -> Self:
+        return super().__new__(cls,
+                               typing.cast(typing.Any, (Point(*p1),
+                                                        Point(*p2))))
+
+    def __repr__(self) -> str:
+        return '{}.{}({})'.format(
+            type(self).__module__,
+            type(self).__name__,
+            tuple.__repr__(self)
+        )
+
+    @property
+    def p1(self) -> Point:
+        return self[0]
+
+    @property
+    def p2(self) -> Point:
+        return self[1]
+
+
+class Path:
+    """Immutable representation of PostgreSQL `path` type."""
+
+    __slots__ = '_is_closed', 'points'
+
+    points: typing.Tuple[Point, ...]
+
+    def __init__(self, *points: typing.Sequence[float],
+                 is_closed: bool = False) -> None:
+        self.points = tuple(Point(*p) for p in points)
+        self._is_closed = is_closed
+
+    @property
+    def is_closed(self) -> bool:
+        return self._is_closed
+
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, Path):
+            return NotImplemented
+
+        return (self.points == other.points and
+                self._is_closed == other._is_closed)
+
+    def __hash__(self) -> int:
+        return hash((self.points, self.is_closed))
+
+    def __iter__(self) -> typing.Iterator[Point]:
+        return iter(self.points)
+
+    def __len__(self) -> int:
+        return len(self.points)
+
+    @typing.overload
+    def __getitem__(self, i: int) -> Point:
+        ...
+
+    @typing.overload
+    def __getitem__(self, i: slice) -> typing.Tuple[Point, ...]:
+        ...
+
+    def __getitem__(
+        self, i: int | slice
+    ) -> Point | typing.Tuple[Point, ...]:
+        return self.points[i]
+
+    def __contains__(self, point: object) -> bool:
+        return point in self.points
+
+
+class Polygon(Path):
+    """Immutable representation of PostgreSQL `polygon` type."""
+
+    __slots__ = ()
+
+    def __init__(self, *points: typing.Sequence[float]) -> None:
+        # polygon is always closed
+        super().__init__(*points, is_closed=True)
+
+
+class Circle(typing.Tuple[Point, float]):
+    """Immutable representation of PostgreSQL `circle` type."""
+
+    __slots__ = ()
+
+    def __new__(cls, center: Point, radius: float) -> Self:
+        return super().__new__(cls, typing.cast(typing.Any, (center, radius)))
+
+    @property
+    def center(self) -> Point:
+        return self[0]
+
+    @property
+    def radius(self) -> float:
+        return self[1]

backend/.venv/lib/python3.12/site-packages/asyncpg/pgproto/uuid.pyx

@@ -0,0 +1,359 @@
+import functools
+import uuid
+
+cimport cython
+cimport cpython
+
+from libc.stdint cimport uint8_t, int8_t
+from libc.string cimport memcpy, memcmp
+
+
+cdef extern from "Python.h":
+    int PyUnicode_1BYTE_KIND
+    const char* PyUnicode_AsUTF8AndSize(
+        object unicode, Py_ssize_t *size) except NULL
+    object PyUnicode_FromKindAndData(
+        int kind, const void *buffer, Py_ssize_t size)
+
+
+cdef extern from "./tohex.h":
+    cdef void uuid_to_str(const char *source, char *dest)
+    cdef void uuid_to_hex(const char *source, char *dest)
+
+
+# A more efficient UUID type implementation
+# (6-7x faster than the starndard uuid.UUID):
+#
+# -= Benchmark results (less is better): =-
+#
+# std_UUID(bytes):      1.2368
+# c_UUID(bytes):      * 0.1645 (7.52x)
+# object():             0.1483
+#
+# std_UUID(str):        1.8038
+# c_UUID(str):        * 0.2313 (7.80x)
+#
+# str(std_UUID()):      1.4625
+# str(c_UUID()):      * 0.2681 (5.46x)
+# str(object()):        0.5975
+#
+# std_UUID().bytes:     0.3508
+# c_UUID().bytes:     * 0.1068 (3.28x)
+#
+# std_UUID().int:       0.0871
+# c_UUID().int:       * 0.0856
+#
+# std_UUID().hex:       0.4871
+# c_UUID().hex:       * 0.1405
+#
+# hash(std_UUID()):     0.3635
+# hash(c_UUID()):     * 0.1564 (2.32x)
+#
+# dct[std_UUID()]:      0.3319
+# dct[c_UUID()]:      * 0.1570 (2.11x)
+#
+# std_UUID() ==:        0.3478
+# c_UUID() ==:        * 0.0915 (3.80x)
+
+
+cdef char _hextable[256]
+_hextable[:] = [
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1, 0,1,2,3,4,5,6,7,8,9,-1,-1,-1,-1,-1,-1,-1,10,11,12,13,14,15,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+    -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
+]
+
+
+std_UUID = uuid.UUID
+
+
+cdef pg_uuid_bytes_from_str(str u, char *out):
+    cdef:
+        const char *orig_buf
+        Py_ssize_t size
+        unsigned char ch
+        uint8_t acc, part, acc_set
+        int i, j
+
+    orig_buf = PyUnicode_AsUTF8AndSize(u, &size)
+    if size > 36 or size < 32:
+        raise ValueError(
+            f'invalid UUID {u!r}: '
+            f'length must be between 32..36 characters, got {size}')
+
+    acc_set = 0
+    j = 0
+    for i in range(size):
+        ch = <unsigned char>orig_buf[i]
+        if ch == <unsigned char>b'-':
+            continue
+
+        part = <uint8_t><int8_t>_hextable[ch]
+        if part == <uint8_t>-1:
+            if ch >= 0x20 and ch <= 0x7e:
+                raise ValueError(
+                    f'invalid UUID {u!r}: unexpected character {chr(ch)!r}')
+            else:
+                raise ValueError('invalid UUID {u!r}: unexpected character')
+
+        if acc_set:
+            acc |= part
+            out[j] = <char>acc
+            acc_set = 0
+            j += 1
+        else:
+            acc = <uint8_t>(part << 4)
+            acc_set = 1
+
+        if j > 16 or (j == 16 and acc_set):
+            raise ValueError(
+                f'invalid UUID {u!r}: decodes to more than 16 bytes')
+
+    if j != 16:
+        raise ValueError(
+            f'invalid UUID {u!r}: decodes to less than 16 bytes')
+
+
+cdef class __UUIDReplaceMe:
+    pass
+
+
+cdef pg_uuid_from_buf(const char *buf):
+    cdef:
+        UUID u = UUID.__new__(UUID)
+    memcpy(u._data, buf, 16)
+    return u
+
+
+@cython.final
+@cython.no_gc_clear
+cdef class UUID(__UUIDReplaceMe):
+
+    cdef:
+        char _data[16]
+        object _int
+        object _hash
+        object __weakref__
+
+    def __cinit__(self):
+        self._int = None
+        self._hash = None
+
+    def __init__(self, inp):
+        cdef:
+            char *buf
+            Py_ssize_t size
+
+        if cpython.PyBytes_Check(inp):
+            cpython.PyBytes_AsStringAndSize(inp, &buf, &size)
+            if size != 16:
+                raise ValueError(f'16 bytes were expected, got {size}')
+            memcpy(self._data, buf, 16)
+
+        elif cpython.PyUnicode_Check(inp):
+            pg_uuid_bytes_from_str(inp, self._data)
+        else:
+            raise TypeError(f'a bytes or str object expected, got {inp!r}')
+
+    @property
+    def bytes(self):
+        return cpython.PyBytes_FromStringAndSize(self._data, 16)
+
+    @property
+    def int(self):
+        if self._int is None:
+            # The cache is important because `self.int` can be
+            # used multiple times by __hash__ etc.
+            #
+            # The or 0 works around a bug interaction between cpython
+            # 3.10 and earlier and Cython ~3.0.11 in which
+            # int.from_bytes returns a "non-canonical 0" and then
+            # Cython's implementation of & mishandles it.
+            # See cython/cython#6480.
+            self._int = int.from_bytes(self.bytes, 'big') or 0
+        return self._int
+
+    @property
+    def is_safe(self):
+        return uuid.SafeUUID.unknown
+
+    def __str__(self):
+        cdef char out[36]
+        uuid_to_str(self._data, out)
+        return PyUnicode_FromKindAndData(PyUnicode_1BYTE_KIND, <void*>out, 36)
+
+    @property
+    def hex(self):
+        cdef char out[32]
+        uuid_to_hex(self._data, out)
+        return PyUnicode_FromKindAndData(PyUnicode_1BYTE_KIND, <void*>out, 32)
+
+    def __repr__(self):
+        return f"UUID('{self}')"
+
+    def __reduce__(self):
+        return (type(self), (self.bytes,))
+
+    def __eq__(self, other):
+        if type(other) is UUID:
+            return memcmp(self._data, (<UUID>other)._data, 16) == 0
+        if isinstance(other, std_UUID):
+            return self.int == other.int
+        return NotImplemented
+
+    def __ne__(self, other):
+        if type(other) is UUID:
+            return memcmp(self._data, (<UUID>other)._data, 16) != 0
+        if isinstance(other, std_UUID):
+            return self.int != other.int
+        return NotImplemented
+
+    def __lt__(self, other):
+        if type(other) is UUID:
+            return memcmp(self._data, (<UUID>other)._data, 16) < 0
+        if isinstance(other, std_UUID):
+            return self.int < other.int
+        return NotImplemented
+
+    def __gt__(self, other):
+        if type(other) is UUID:
+            return memcmp(self._data, (<UUID>other)._data, 16) > 0
+        if isinstance(other, std_UUID):
+            return self.int > other.int
+        return NotImplemented
+
+    def __le__(self, other):
+        if type(other) is UUID:
+            return memcmp(self._data, (<UUID>other)._data, 16) <= 0
+        if isinstance(other, std_UUID):
+            return self.int <= other.int
+        return NotImplemented
+
+    def __ge__(self, other):
+        if type(other) is UUID:
+            return memcmp(self._data, (<UUID>other)._data, 16) >= 0
+        if isinstance(other, std_UUID):
+            return self.int >= other.int
+        return NotImplemented
+
+    def __hash__(self):
+        # In EdgeDB every schema object has a uuid and there are
+        # huge hash-maps of them. We want UUID.__hash__ to be
+        # as fast as possible.
+        if self._hash is not None:
+            return self._hash
+
+        self._hash = hash(self.int)
+        return self._hash
+
+    def __int__(self):
+        return self.int
+
+    @property
+    def bytes_le(self):
+        bytes = self.bytes
+        return (bytes[4-1::-1] + bytes[6-1:4-1:-1] + bytes[8-1:6-1:-1] +
+                bytes[8:])
+
+    @property
+    def fields(self):
+        return (self.time_low, self.time_mid, self.time_hi_version,
+                self.clock_seq_hi_variant, self.clock_seq_low, self.node)
+
+    @property
+    def time_low(self):
+        return self.int >> 96
+
+    @property
+    def time_mid(self):
+        return (self.int >> 80) & 0xffff
+
+    @property
+    def time_hi_version(self):
+        return (self.int >> 64) & 0xffff
+
+    @property
+    def clock_seq_hi_variant(self):
+        return (self.int >> 56) & 0xff
+
+    @property
+    def clock_seq_low(self):
+        return (self.int >> 48) & 0xff
+
+    @property
+    def time(self):
+        return (((self.time_hi_version & 0x0fff) << 48) |
+                (self.time_mid << 32) | self.time_low)
+
+    @property
+    def clock_seq(self):
+        return (((self.clock_seq_hi_variant & 0x3f) << 8) |
+                self.clock_seq_low)
+
+    @property
+    def node(self):
+        return self.int & 0xffffffffffff
+
+    @property
+    def urn(self):
+        return 'urn:uuid:' + str(self)
+
+    @property
+    def variant(self):
+        if not self.int & (0x8000 << 48):
+            return uuid.RESERVED_NCS
+        elif not self.int & (0x4000 << 48):
+            return uuid.RFC_4122
+        elif not self.int & (0x2000 << 48):
+            return uuid.RESERVED_MICROSOFT
+        else:
+            return uuid.RESERVED_FUTURE
+
+    @property
+    def version(self):
+        # The version bits are only meaningful for RFC 4122 UUIDs.
+        if self.variant == uuid.RFC_4122:
+            return int((self.int >> 76) & 0xf)
+
+
+# <hack>
+# In order for `isinstance(pgproto.UUID, uuid.UUID)` to work,
+# patch __bases__ and __mro__ by injecting `uuid.UUID`.
+#
+# We apply brute-force here because the following pattern stopped
+# working with Python 3.8:
+#
+#   cdef class OurUUID:
+#       ...
+#
+#   class UUID(OurUUID, uuid.UUID):
+#       ...
+#
+# With Python 3.8 it now produces
+#
+#   "TypeError: multiple bases have instance lay-out conflict"
+#
+# error.  Maybe it's possible to fix this some other way, but
+# the best solution possible would be to just contribute our
+# faster UUID to the standard library and not have this problem
+# at all.  For now this hack is pretty safe and should be
+# compatible with future Pythons for long enough.
+#
+assert UUID.__bases__[0] is __UUIDReplaceMe
+assert UUID.__mro__[1] is __UUIDReplaceMe
+cpython.Py_INCREF(std_UUID)
+cpython.PyTuple_SET_ITEM(UUID.__bases__, 0, std_UUID)
+cpython.Py_INCREF(std_UUID)
+cpython.PyTuple_SET_ITEM(UUID.__mro__, 1, std_UUID)
+# </hack>
+
+
+pg_UUID = UUID

backend/.venv/lib/python3.12/site-packages/asyncpg/prepared_stmt.py

@@ -0,0 +1,286 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+import json
+import typing
+
+from . import connresource
+from . import cursor
+from . import exceptions
+
+
+class PreparedStatement(connresource.ConnectionResource):
+    """A representation of a prepared statement."""
+
+    __slots__ = ('_state', '_query', '_last_status')
+
+    def __init__(self, connection, query, state):
+        super().__init__(connection)
+        self._state = state
+        self._query = query
+        state.attach()
+        self._last_status = None
+
+    @connresource.guarded
+    def get_name(self) -> str:
+        """Return the name of this prepared statement.
+
+        .. versionadded:: 0.25.0
+        """
+        return self._state.name
+
+    @connresource.guarded
+    def get_query(self) -> str:
+        """Return the text of the query for this prepared statement.
+
+        Example::
+
+            stmt = await connection.prepare('SELECT $1::int')
+            assert stmt.get_query() == "SELECT $1::int"
+        """
+        return self._query
+
+    @connresource.guarded
+    def get_statusmsg(self) -> str:
+        """Return the status of the executed command.
+
+        Example::
+
+            stmt = await connection.prepare('CREATE TABLE mytab (a int)')
+            await stmt.fetch()
+            assert stmt.get_statusmsg() == "CREATE TABLE"
+        """
+        if self._last_status is None:
+            return self._last_status
+        return self._last_status.decode()
+
+    @connresource.guarded
+    def get_parameters(self):
+        """Return a description of statement parameters types.
+
+        :return: A tuple of :class:`asyncpg.types.Type`.
+
+        Example::
+
+            stmt = await connection.prepare('SELECT ($1::int, $2::text)')
+            print(stmt.get_parameters())
+
+            # Will print:
+            #   (Type(oid=23, name='int4', kind='scalar', schema='pg_catalog'),
+            #    Type(oid=25, name='text', kind='scalar', schema='pg_catalog'))
+        """
+        return self._state._get_parameters()
+
+    @connresource.guarded
+    def get_attributes(self):
+        """Return a description of relation attributes (columns).
+
+        :return: A tuple of :class:`asyncpg.types.Attribute`.
+
+        Example::
+
+            st = await self.con.prepare('''
+                SELECT typname, typnamespace FROM pg_type
+            ''')
+            print(st.get_attributes())
+
+            # Will print:
+            #   (Attribute(
+            #       name='typname',
+            #       type=Type(oid=19, name='name', kind='scalar',
+            #                 schema='pg_catalog')),
+            #    Attribute(
+            #       name='typnamespace',
+            #       type=Type(oid=26, name='oid', kind='scalar',
+            #                 schema='pg_catalog')))
+        """
+        return self._state._get_attributes()
+
+    @connresource.guarded
+    def cursor(self, *args, prefetch=None,
+               timeout=None) -> cursor.CursorFactory:
+        """Return a *cursor factory* for the prepared statement.
+
+        :param args: Query arguments.
+        :param int prefetch: The number of rows the *cursor iterator*
+                             will prefetch (defaults to ``50``.)
+        :param float timeout: Optional timeout in seconds.
+
+        :return: A :class:`~cursor.CursorFactory` object.
+        """
+        return cursor.CursorFactory(
+            self._connection,
+            self._query,
+            self._state,
+            args,
+            prefetch,
+            timeout,
+            self._state.record_class,
+        )
+
+    @connresource.guarded
+    async def explain(self, *args, analyze=False):
+        """Return the execution plan of the statement.
+
+        :param args: Query arguments.
+        :param analyze: If ``True``, the statement will be executed and
+                        the run time statitics added to the return value.
+
+        :return: An object representing the execution plan.  This value
+                 is actually a deserialized JSON output of the SQL
+                 ``EXPLAIN`` command.
+        """
+        query = 'EXPLAIN (FORMAT JSON, VERBOSE'
+        if analyze:
+            query += ', ANALYZE) '
+        else:
+            query += ') '
+        query += self._state.query
+
+        if analyze:
+            # From PostgreSQL docs:
+            # Important: Keep in mind that the statement is actually
+            # executed when the ANALYZE option is used. Although EXPLAIN
+            # will discard any output that a SELECT would return, other
+            # side effects of the statement will happen as usual. If you
+            # wish to use EXPLAIN ANALYZE on an INSERT, UPDATE, DELETE,
+            # MERGE, CREATE TABLE AS, or EXECUTE statement without letting
+            # the command affect your data, use this approach:
+            #     BEGIN;
+            #     EXPLAIN ANALYZE ...;
+            #     ROLLBACK;
+            tr = self._connection.transaction()
+            await tr.start()
+            try:
+                data = await self._connection.fetchval(query, *args)
+            finally:
+                await tr.rollback()
+        else:
+            data = await self._connection.fetchval(query, *args)
+
+        return json.loads(data)
+
+    @connresource.guarded
+    async def fetch(self, *args, timeout=None):
+        r"""Execute the statement and return a list of :class:`Record` objects.
+
+        :param str query: Query text
+        :param args: Query arguments
+        :param float timeout: Optional timeout value in seconds.
+
+        :return: A list of :class:`Record` instances.
+        """
+        data = await self.__bind_execute(args, 0, timeout)
+        return data
+
+    @connresource.guarded
+    async def fetchval(self, *args, column=0, timeout=None):
+        """Execute the statement and return a value in the first row.
+
+        :param args: Query arguments.
+        :param int column: Numeric index within the record of the value to
+                           return (defaults to 0).
+        :param float timeout: Optional timeout value in seconds.
+                            If not specified, defaults to the value of
+                            ``command_timeout`` argument to the ``Connection``
+                            instance constructor.
+
+        :return: The value of the specified column of the first record.
+        """
+        data = await self.__bind_execute(args, 1, timeout)
+        if not data:
+            return None
+        return data[0][column]
+
+    @connresource.guarded
+    async def fetchrow(self, *args, timeout=None):
+        """Execute the statement and return the first row.
+
+        :param str query: Query text
+        :param args: Query arguments
+        :param float timeout: Optional timeout value in seconds.
+
+        :return: The first row as a :class:`Record` instance.
+        """
+        data = await self.__bind_execute(args, 1, timeout)
+        if not data:
+            return None
+        return data[0]
+
+    @connresource.guarded
+    async def fetchmany(self, args, *, timeout=None):
+        """Execute the statement and return a list of :class:`Record` objects.
+
+        :param args: Query arguments.
+        :param float timeout: Optional timeout value in seconds.
+
+        :return: A list of :class:`Record` instances.
+
+        .. versionadded:: 0.30.0
+        """
+        return await self.__do_execute(
+            lambda protocol: protocol.bind_execute_many(
+                self._state,
+                args,
+                portal_name='',
+                timeout=timeout,
+                return_rows=True,
+            )
+        )
+
+    @connresource.guarded
+    async def executemany(self, args, *, timeout: typing.Optional[float]=None):
+        """Execute the statement for each sequence of arguments in *args*.
+
+        :param args: An iterable containing sequences of arguments.
+        :param float timeout: Optional timeout value in seconds.
+        :return None: This method discards the results of the operations.
+
+        .. versionadded:: 0.22.0
+        """
+        return await self.__do_execute(
+            lambda protocol: protocol.bind_execute_many(
+                self._state,
+                args,
+                portal_name='',
+                timeout=timeout,
+                return_rows=False,
+            ))
+
+    async def __do_execute(self, executor):
+        protocol = self._connection._protocol
+        try:
+            return await executor(protocol)
+        except exceptions.OutdatedSchemaCacheError:
+            await self._connection.reload_schema_state()
+            # We can not find all manually created prepared statements, so just
+            # drop known cached ones in the `self._connection`.
+            # Other manually created prepared statements will fail and
+            # invalidate themselves (unfortunately, clearing caches again).
+            self._state.mark_closed()
+            raise
+
+    async def __bind_execute(self, args, limit, timeout):
+        data, status, _ = await self.__do_execute(
+            lambda protocol: protocol.bind_execute(
+                self._state, args, '', limit, True, timeout))
+        self._last_status = status
+        return data
+
+    def _check_open(self, meth_name):
+        if self._state.closed:
+            raise exceptions.InterfaceError(
+                'cannot call PreparedStmt.{}(): '
+                'the prepared statement is closed'.format(meth_name))
+
+    def _check_conn_validity(self, meth_name):
+        self._check_open(meth_name)
+        super()._check_conn_validity(meth_name)
+
+    def __del__(self):
+        self._state.detach()
+        self._connection._maybe_gc_stmt(self._state)

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/__init__.py

@@ -0,0 +1,12 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+# flake8: NOQA
+
+from __future__ import annotations
+
+from .protocol import Protocol, NO_TIMEOUT, BUILTIN_TYPE_NAME_MAP
+from .record import Record

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/codecs/array.pyx

@@ -0,0 +1,875 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from collections.abc import (Iterable as IterableABC,
+                             Mapping as MappingABC,
+                             Sized as SizedABC)
+
+from asyncpg import exceptions
+
+
+DEF ARRAY_MAXDIM = 6  # defined in postgresql/src/includes/c.h
+
+# "NULL"
+cdef Py_UCS4 *APG_NULL = [0x004E, 0x0055, 0x004C, 0x004C, 0x0000]
+
+
+ctypedef object (*encode_func_ex)(ConnectionSettings settings,
+                                  WriteBuffer buf,
+                                  object obj,
+                                  const void *arg)
+
+
+ctypedef object (*decode_func_ex)(ConnectionSettings settings,
+                                  FRBuffer *buf,
+                                  const void *arg)
+
+
+cdef inline bint _is_trivial_container(object obj):
+    return cpython.PyUnicode_Check(obj) or cpython.PyBytes_Check(obj) or \
+            cpythonx.PyByteArray_Check(obj) or cpythonx.PyMemoryView_Check(obj)
+
+
+cdef inline _is_array_iterable(object obj):
+    return (
+        isinstance(obj, IterableABC) and
+        isinstance(obj, SizedABC) and
+        not _is_trivial_container(obj) and
+        not isinstance(obj, MappingABC)
+    )
+
+
+cdef inline _is_sub_array_iterable(object obj):
+    # Sub-arrays have a specialized check, because we treat
+    # nested tuples as records.
+    return _is_array_iterable(obj) and not cpython.PyTuple_Check(obj)
+
+
+cdef _get_array_shape(object obj, int32_t *dims, int32_t *ndims):
+    cdef:
+        ssize_t mylen = len(obj)
+        ssize_t elemlen = -2
+        object it
+
+    if mylen > _MAXINT32:
+        raise ValueError('too many elements in array value')
+
+    if ndims[0] > ARRAY_MAXDIM:
+        raise ValueError(
+            'number of array dimensions ({}) exceed the maximum expected ({})'.
+                format(ndims[0], ARRAY_MAXDIM))
+
+    dims[ndims[0] - 1] = <int32_t>mylen
+
+    for elem in obj:
+        if _is_sub_array_iterable(elem):
+            if elemlen == -2:
+                elemlen = len(elem)
+                if elemlen > _MAXINT32:
+                    raise ValueError('too many elements in array value')
+                ndims[0] += 1
+                _get_array_shape(elem, dims, ndims)
+            else:
+                if len(elem) != elemlen:
+                    raise ValueError('non-homogeneous array')
+        else:
+            if elemlen >= 0:
+                raise ValueError('non-homogeneous array')
+            else:
+                elemlen = -1
+
+
+cdef _write_array_data(ConnectionSettings settings, object obj, int32_t ndims,
+                       int32_t dim, WriteBuffer elem_data,
+                       encode_func_ex encoder, const void *encoder_arg):
+    if dim < ndims - 1:
+        for item in obj:
+            _write_array_data(settings, item, ndims, dim + 1, elem_data,
+                              encoder, encoder_arg)
+    else:
+        for item in obj:
+            if item is None:
+                elem_data.write_int32(-1)
+            else:
+                try:
+                    encoder(settings, elem_data, item, encoder_arg)
+                except TypeError as e:
+                    raise ValueError(
+                        'invalid array element: {}'.format(e.args[0])) from None
+
+
+cdef inline array_encode(ConnectionSettings settings, WriteBuffer buf,
+                         object obj, uint32_t elem_oid,
+                         encode_func_ex encoder, const void *encoder_arg):
+    cdef:
+        WriteBuffer elem_data
+        int32_t dims[ARRAY_MAXDIM]
+        int32_t ndims = 1
+        int32_t i
+
+    if not _is_array_iterable(obj):
+        raise TypeError(
+            'a sized iterable container expected (got type {!r})'.format(
+                type(obj).__name__))
+
+    _get_array_shape(obj, dims, &ndims)
+
+    elem_data = WriteBuffer.new()
+
+    if ndims > 1:
+        _write_array_data(settings, obj, ndims, 0, elem_data,
+                          encoder, encoder_arg)
+    else:
+        for i, item in enumerate(obj):
+            if item is None:
+                elem_data.write_int32(-1)
+            else:
+                try:
+                    encoder(settings, elem_data, item, encoder_arg)
+                except TypeError as e:
+                    raise ValueError(
+                        'invalid array element at index {}: {}'.format(
+                            i, e.args[0])) from None
+
+    buf.write_int32(12 + 8 * ndims + elem_data.len())
+    # Number of dimensions
+    buf.write_int32(ndims)
+    # flags
+    buf.write_int32(0)
+    # element type
+    buf.write_int32(<int32_t>elem_oid)
+    # upper / lower bounds
+    for i in range(ndims):
+        buf.write_int32(dims[i])
+        buf.write_int32(1)
+    # element data
+    buf.write_buffer(elem_data)
+
+
+cdef _write_textarray_data(ConnectionSettings settings, object obj,
+                           int32_t ndims, int32_t dim, WriteBuffer array_data,
+                           encode_func_ex encoder, const void *encoder_arg,
+                           Py_UCS4 typdelim):
+    cdef:
+        ssize_t i = 0
+        int8_t delim = <int8_t>typdelim
+        WriteBuffer elem_data
+        Py_buffer pybuf
+        const char *elem_str
+        char ch
+        ssize_t elem_len
+        ssize_t quoted_elem_len
+        bint need_quoting
+
+    array_data.write_byte(b'{')
+
+    if dim < ndims - 1:
+        for item in obj:
+            if i > 0:
+                array_data.write_byte(delim)
+                array_data.write_byte(b' ')
+            _write_textarray_data(settings, item, ndims, dim + 1, array_data,
+                                  encoder, encoder_arg, typdelim)
+            i += 1
+    else:
+        for item in obj:
+            elem_data = WriteBuffer.new()
+
+            if i > 0:
+                array_data.write_byte(delim)
+                array_data.write_byte(b' ')
+
+            if item is None:
+                array_data.write_bytes(b'NULL')
+                i += 1
+                continue
+            else:
+                try:
+                    encoder(settings, elem_data, item, encoder_arg)
+                except TypeError as e:
+                    raise ValueError(
+                        'invalid array element: {}'.format(
+                            e.args[0])) from None
+
+            # element string length (first four bytes are the encoded length.)
+            elem_len = elem_data.len() - 4
+
+            if elem_len == 0:
+                # Empty string
+                array_data.write_bytes(b'""')
+            else:
+                cpython.PyObject_GetBuffer(
+                    elem_data, &pybuf, cpython.PyBUF_SIMPLE)
+
+                elem_str = <const char*>(pybuf.buf) + 4
+
+                try:
+                    if not apg_strcasecmp_char(elem_str, b'NULL'):
+                        array_data.write_byte(b'"')
+                        array_data.write_cstr(elem_str, 4)
+                        array_data.write_byte(b'"')
+                    else:
+                        quoted_elem_len = elem_len
+                        need_quoting = False
+
+                        for i in range(elem_len):
+                            ch = elem_str[i]
+                            if ch == b'"' or ch == b'\\':
+                                # Quotes and backslashes need escaping.
+                                quoted_elem_len += 1
+                                need_quoting = True
+                            elif (ch == b'{' or ch == b'}' or ch == delim or
+                                    apg_ascii_isspace(<uint32_t>ch)):
+                                need_quoting = True
+
+                        if need_quoting:
+                            array_data.write_byte(b'"')
+
+                            if quoted_elem_len == elem_len:
+                                array_data.write_cstr(elem_str, elem_len)
+                            else:
+                                # Escaping required.
+                                for i in range(elem_len):
+                                    ch = elem_str[i]
+                                    if ch == b'"' or ch == b'\\':
+                                        array_data.write_byte(b'\\')
+                                    array_data.write_byte(ch)
+
+                            array_data.write_byte(b'"')
+                        else:
+                            array_data.write_cstr(elem_str, elem_len)
+                finally:
+                    cpython.PyBuffer_Release(&pybuf)
+
+            i += 1
+
+    array_data.write_byte(b'}')
+
+
+cdef inline textarray_encode(ConnectionSettings settings, WriteBuffer buf,
+                             object obj, encode_func_ex encoder,
+                             const void *encoder_arg, Py_UCS4 typdelim):
+    cdef:
+        WriteBuffer array_data
+        int32_t dims[ARRAY_MAXDIM]
+        int32_t ndims = 1
+        int32_t i
+
+    if not _is_array_iterable(obj):
+        raise TypeError(
+            'a sized iterable container expected (got type {!r})'.format(
+                type(obj).__name__))
+
+    _get_array_shape(obj, dims, &ndims)
+
+    array_data = WriteBuffer.new()
+    _write_textarray_data(settings, obj, ndims, 0, array_data,
+                          encoder, encoder_arg, typdelim)
+    buf.write_int32(array_data.len())
+    buf.write_buffer(array_data)
+
+
+cdef inline array_decode(ConnectionSettings settings, FRBuffer *buf,
+                         decode_func_ex decoder, const void *decoder_arg):
+    cdef:
+        int32_t ndims = hton.unpack_int32(frb_read(buf, 4))
+        int32_t flags = hton.unpack_int32(frb_read(buf, 4))
+        uint32_t elem_oid = <uint32_t>hton.unpack_int32(frb_read(buf, 4))
+        list result
+        int i
+        int32_t elem_len
+        int32_t elem_count = 1
+        FRBuffer elem_buf
+        int32_t dims[ARRAY_MAXDIM]
+        Codec elem_codec
+
+    if ndims == 0:
+        return []
+
+    if ndims > ARRAY_MAXDIM:
+        raise exceptions.ProtocolError(
+            'number of array dimensions ({}) exceed the maximum expected ({})'.
+            format(ndims, ARRAY_MAXDIM))
+    elif ndims < 0:
+        raise exceptions.ProtocolError(
+            'unexpected array dimensions value: {}'.format(ndims))
+
+    for i in range(ndims):
+        dims[i] = hton.unpack_int32(frb_read(buf, 4))
+        if dims[i] < 0:
+            raise exceptions.ProtocolError(
+                'unexpected array dimension size: {}'.format(dims[i]))
+        # Ignore the lower bound information
+        frb_read(buf, 4)
+
+    if ndims == 1:
+        # Fast path for flat arrays
+        elem_count = dims[0]
+        result = cpython.PyList_New(elem_count)
+
+        for i in range(elem_count):
+            elem_len = hton.unpack_int32(frb_read(buf, 4))
+            if elem_len == -1:
+                elem = None
+            else:
+                frb_slice_from(&elem_buf, buf, elem_len)
+                elem = decoder(settings, &elem_buf, decoder_arg)
+
+            cpython.Py_INCREF(elem)
+            cpython.PyList_SET_ITEM(result, i, elem)
+
+    else:
+        result = _nested_array_decode(settings, buf,
+                                      decoder, decoder_arg, ndims, dims,
+                                      &elem_buf)
+
+    return result
+
+
+cdef _nested_array_decode(ConnectionSettings settings,
+                          FRBuffer *buf,
+                          decode_func_ex decoder,
+                          const void *decoder_arg,
+                          int32_t ndims, int32_t *dims,
+                          FRBuffer *elem_buf):
+
+    cdef:
+        int32_t elem_len
+        int64_t i, j
+        int64_t array_len = 1
+        object elem, stride
+        # An array of pointers to lists for each current array level.
+        void *strides[ARRAY_MAXDIM]
+        # An array of current positions at each array level.
+        int32_t indexes[ARRAY_MAXDIM]
+
+    for i in range(ndims):
+        array_len *= dims[i]
+        indexes[i] = 0
+        strides[i] = NULL
+
+    if array_len == 0:
+        # A multidimensional array with a zero-sized dimension?
+        return []
+
+    elif array_len < 0:
+        # Array length overflow
+        raise exceptions.ProtocolError('array length overflow')
+
+    for i in range(array_len):
+        # Decode the element.
+        elem_len = hton.unpack_int32(frb_read(buf, 4))
+        if elem_len == -1:
+            elem = None
+        else:
+            elem = decoder(settings,
+                           frb_slice_from(elem_buf, buf, elem_len),
+                           decoder_arg)
+
+        # Take an explicit reference for PyList_SET_ITEM in the below
+        # loop expects this.
+        cpython.Py_INCREF(elem)
+
+        # Iterate over array dimentions and put the element in
+        # the correctly nested sublist.
+        for j in reversed(range(ndims)):
+            if indexes[j] == 0:
+                # Allocate the list for this array level.
+                stride = cpython.PyList_New(dims[j])
+
+                strides[j] = <void*><cpython.PyObject>stride
+                # Take an explicit reference for PyList_SET_ITEM below
+                # expects this.
+                cpython.Py_INCREF(stride)
+
+            stride = <object><cpython.PyObject*>strides[j]
+            cpython.PyList_SET_ITEM(stride, indexes[j], elem)
+            indexes[j] += 1
+
+            if indexes[j] == dims[j] and j != 0:
+                # This array level is full, continue the
+                # ascent in the dimensions so that this level
+                # sublist will be appened to the parent list.
+                elem = stride
+                # Reset the index, this will cause the
+                # new list to be allocated on the next
+                # iteration on this array axis.
+                indexes[j] = 0
+            else:
+                break
+
+    stride = <object><cpython.PyObject*>strides[0]
+    # Since each element in strides has a refcount of 1,
+    # returning strides[0] will increment it to 2, so
+    # balance that.
+    cpython.Py_DECREF(stride)
+    return stride
+
+
+cdef textarray_decode(ConnectionSettings settings, FRBuffer *buf,
+                      decode_func_ex decoder, const void *decoder_arg,
+                      Py_UCS4 typdelim):
+    cdef:
+        Py_UCS4 *array_text
+        str s
+
+    # Make a copy of array data since we will be mutating it for
+    # the purposes of element decoding.
+    s = pgproto.text_decode(settings, buf)
+    array_text = cpythonx.PyUnicode_AsUCS4Copy(s)
+
+    try:
+        return _textarray_decode(
+            settings, array_text, decoder, decoder_arg, typdelim)
+    except ValueError as e:
+        raise exceptions.ProtocolError(
+            'malformed array literal {!r}: {}'.format(s, e.args[0]))
+    finally:
+        cpython.PyMem_Free(array_text)
+
+
+cdef _textarray_decode(ConnectionSettings settings,
+                       Py_UCS4 *array_text,
+                       decode_func_ex decoder,
+                       const void *decoder_arg,
+                       Py_UCS4 typdelim):
+
+    cdef:
+        bytearray array_bytes
+        list result
+        list new_stride
+        Py_UCS4 *ptr
+        int32_t ndims = 0
+        int32_t ubound = 0
+        int32_t lbound = 0
+        int32_t dims[ARRAY_MAXDIM]
+        int32_t inferred_dims[ARRAY_MAXDIM]
+        int32_t inferred_ndims = 0
+        void *strides[ARRAY_MAXDIM]
+        int32_t indexes[ARRAY_MAXDIM]
+        int32_t nest_level = 0
+        int32_t item_level = 0
+        bint end_of_array = False
+
+        bint end_of_item = False
+        bint has_quoting = False
+        bint strip_spaces = False
+        bint in_quotes = False
+        Py_UCS4 *item_start
+        Py_UCS4 *item_ptr
+        Py_UCS4 *item_end
+
+        int i
+        object item
+        str item_text
+        FRBuffer item_buf
+        char *pg_item_str
+        ssize_t pg_item_len
+
+    ptr = array_text
+
+    while True:
+        while apg_ascii_isspace(ptr[0]):
+            ptr += 1
+
+        if ptr[0] != '[':
+            # Finished parsing dimensions spec.
+            break
+
+        ptr += 1  # '['
+
+        if ndims > ARRAY_MAXDIM:
+            raise ValueError(
+                'number of array dimensions ({}) exceed the '
+                'maximum expected ({})'.format(ndims, ARRAY_MAXDIM))
+
+        ptr = apg_parse_int32(ptr, &ubound)
+        if ptr == NULL:
+            raise ValueError('missing array dimension value')
+
+        if ptr[0] == ':':
+            ptr += 1
+            lbound = ubound
+
+            # [lower:upper] spec.  We disregard the lbound for decoding.
+            ptr = apg_parse_int32(ptr, &ubound)
+            if ptr == NULL:
+                raise ValueError('missing array dimension value')
+        else:
+            lbound = 1
+
+        if ptr[0] != ']':
+            raise ValueError('missing \']\' after array dimensions')
+
+        ptr += 1  # ']'
+
+        dims[ndims] = ubound - lbound + 1
+        ndims += 1
+
+    if ndims != 0:
+        # If dimensions were given, the '=' token is expected.
+        if ptr[0] != '=':
+            raise ValueError('missing \'=\' after array dimensions')
+
+        ptr += 1  # '='
+
+        # Skip any whitespace after the '=', whitespace
+        # before was consumed in the above loop.
+        while apg_ascii_isspace(ptr[0]):
+            ptr += 1
+
+        # Infer the dimensions from the brace structure in the
+        # array literal body, and check that it matches the explicit
+        # spec.  This also validates that the array literal is sane.
+        _infer_array_dims(ptr, typdelim, inferred_dims, &inferred_ndims)
+
+        if inferred_ndims != ndims:
+            raise ValueError(
+                'specified array dimensions do not match array content')
+
+        for i in range(ndims):
+            if inferred_dims[i] != dims[i]:
+                raise ValueError(
+                    'specified array dimensions do not match array content')
+    else:
+        # Infer the dimensions from the brace structure in the array literal
+        # body.  This also validates that the array literal is sane.
+        _infer_array_dims(ptr, typdelim, dims, &ndims)
+
+    while not end_of_array:
+        # We iterate over the literal character by character
+        # and modify the string in-place removing the array-specific
+        # quoting and determining the boundaries of each element.
+        end_of_item = has_quoting = in_quotes = False
+        strip_spaces = True
+
+        # Pointers to array element start, end, and the current pointer
+        # tracking the position where characters are written when
+        # escaping is folded.
+        item_start = item_end = item_ptr = ptr
+        item_level = 0
+
+        while not end_of_item:
+            if ptr[0] == '"':
+                in_quotes = not in_quotes
+                if in_quotes:
+                    strip_spaces = False
+                else:
+                    item_end = item_ptr
+                has_quoting = True
+
+            elif ptr[0] == '\\':
+                # Quoted character, collapse the backslash.
+                ptr += 1
+                has_quoting = True
+                item_ptr[0] = ptr[0]
+                item_ptr += 1
+                strip_spaces = False
+                item_end = item_ptr
+
+            elif in_quotes:
+                # Consume the string until we see the closing quote.
+                item_ptr[0] = ptr[0]
+                item_ptr += 1
+
+            elif ptr[0] == '{':
+                # Nesting level increase.
+                nest_level += 1
+
+                indexes[nest_level - 1] = 0
+                new_stride = cpython.PyList_New(dims[nest_level - 1])
+                strides[nest_level - 1] = \
+                    <void*>(<cpython.PyObject>new_stride)
+
+                if nest_level > 1:
+                    cpython.Py_INCREF(new_stride)
+                    cpython.PyList_SET_ITEM(
+                        <object><cpython.PyObject*>strides[nest_level - 2],
+                        indexes[nest_level - 2],
+                        new_stride)
+                else:
+                    result = new_stride
+
+            elif ptr[0] == '}':
+                if item_level == 0:
+                    # Make sure we keep track of which nesting
+                    # level the item belongs to, as the loop
+                    # will continue to consume closing braces
+                    # until the delimiter or the end of input.
+                    item_level = nest_level
+
+                nest_level -= 1
+
+                if nest_level == 0:
+                    end_of_array = end_of_item = True
+
+            elif ptr[0] == typdelim:
+                # Array element delimiter,
+                end_of_item = True
+                if item_level == 0:
+                    item_level = nest_level
+
+            elif apg_ascii_isspace(ptr[0]):
+                if not strip_spaces:
+                    item_ptr[0] = ptr[0]
+                    item_ptr += 1
+                # Ignore the leading literal whitespace.
+
+            else:
+                item_ptr[0] = ptr[0]
+                item_ptr += 1
+                strip_spaces = False
+                item_end = item_ptr
+
+            ptr += 1
+
+        # end while not end_of_item
+
+        if item_end == item_start:
+            # Empty array
+            continue
+
+        item_end[0] = '\0'
+
+        if not has_quoting and apg_strcasecmp(item_start, APG_NULL) == 0:
+            # NULL element.
+            item = None
+        else:
+            # XXX: find a way to avoid the redundant encode/decode
+            # cycle here.
+            item_text = cpythonx.PyUnicode_FromKindAndData(
+                cpythonx.PyUnicode_4BYTE_KIND,
+                <void *>item_start,
+                item_end - item_start)
+
+            # Prepare the element buffer and call the text decoder
+            # for the element type.
+            pgproto.as_pg_string_and_size(
+                settings, item_text, &pg_item_str, &pg_item_len)
+            frb_init(&item_buf, pg_item_str, pg_item_len)
+            item = decoder(settings, &item_buf, decoder_arg)
+
+        # Place the decoded element in the array.
+        cpython.Py_INCREF(item)
+        cpython.PyList_SET_ITEM(
+            <object><cpython.PyObject*>strides[item_level - 1],
+            indexes[item_level - 1],
+            item)
+
+        if nest_level > 0:
+            indexes[nest_level - 1] += 1
+
+    return result
+
+
+cdef enum _ArrayParseState:
+    APS_START = 1
+    APS_STRIDE_STARTED = 2
+    APS_STRIDE_DONE = 3
+    APS_STRIDE_DELIMITED = 4
+    APS_ELEM_STARTED = 5
+    APS_ELEM_DELIMITED = 6
+
+
+cdef _UnexpectedCharacter(const Py_UCS4 *array_text, const Py_UCS4 *ptr):
+    return ValueError('unexpected character {!r} at position {}'.format(
+        cpython.PyUnicode_FromOrdinal(<int>ptr[0]), ptr - array_text + 1))
+
+
+cdef _infer_array_dims(const Py_UCS4 *array_text,
+                       Py_UCS4 typdelim,
+                       int32_t *dims,
+                       int32_t *ndims):
+    cdef:
+        const Py_UCS4 *ptr = array_text
+        int i
+        int nest_level = 0
+        bint end_of_array = False
+        bint end_of_item = False
+        bint in_quotes = False
+        bint array_is_empty = True
+        int stride_len[ARRAY_MAXDIM]
+        int prev_stride_len[ARRAY_MAXDIM]
+        _ArrayParseState parse_state = APS_START
+
+    for i in range(ARRAY_MAXDIM):
+        dims[i] = prev_stride_len[i] = 0
+        stride_len[i] = 1
+
+    while not end_of_array:
+        end_of_item = False
+
+        while not end_of_item:
+            if ptr[0] == '\0':
+                raise ValueError('unexpected end of string')
+
+            elif ptr[0] == '"':
+                if (parse_state not in (APS_STRIDE_STARTED,
+                                        APS_ELEM_DELIMITED) and
+                        not (parse_state == APS_ELEM_STARTED and in_quotes)):
+                    raise _UnexpectedCharacter(array_text, ptr)
+
+                in_quotes = not in_quotes
+                if in_quotes:
+                    parse_state = APS_ELEM_STARTED
+                    array_is_empty = False
+
+            elif ptr[0] == '\\':
+                if parse_state not in (APS_STRIDE_STARTED,
+                                       APS_ELEM_STARTED,
+                                       APS_ELEM_DELIMITED):
+                    raise _UnexpectedCharacter(array_text, ptr)
+
+                parse_state = APS_ELEM_STARTED
+                array_is_empty = False
+
+                if ptr[1] != '\0':
+                    ptr += 1
+                else:
+                    raise ValueError('unexpected end of string')
+
+            elif in_quotes:
+                # Ignore everything inside the quotes.
+                pass
+
+            elif ptr[0] == '{':
+                if parse_state not in (APS_START,
+                                       APS_STRIDE_STARTED,
+                                       APS_STRIDE_DELIMITED):
+                    raise _UnexpectedCharacter(array_text, ptr)
+
+                parse_state = APS_STRIDE_STARTED
+                if nest_level >= ARRAY_MAXDIM:
+                    raise ValueError(
+                        'number of array dimensions ({}) exceed the '
+                        'maximum expected ({})'.format(
+                            nest_level, ARRAY_MAXDIM))
+
+                dims[nest_level] = 0
+                nest_level += 1
+                if ndims[0] < nest_level:
+                    ndims[0] = nest_level
+
+            elif ptr[0] == '}':
+                if (parse_state not in (APS_ELEM_STARTED, APS_STRIDE_DONE) and
+                        not (nest_level == 1 and
+                             parse_state == APS_STRIDE_STARTED)):
+                    raise _UnexpectedCharacter(array_text, ptr)
+
+                parse_state = APS_STRIDE_DONE
+
+                if nest_level == 0:
+                    raise _UnexpectedCharacter(array_text, ptr)
+
+                nest_level -= 1
+
+                if (prev_stride_len[nest_level] != 0 and
+                        stride_len[nest_level] != prev_stride_len[nest_level]):
+                    raise ValueError(
+                        'inconsistent sub-array dimensions'
+                        ' at position {}'.format(
+                            ptr - array_text + 1))
+
+                prev_stride_len[nest_level] = stride_len[nest_level]
+                stride_len[nest_level] = 1
+                if nest_level == 0:
+                    end_of_array = end_of_item = True
+                else:
+                    dims[nest_level - 1] += 1
+
+            elif ptr[0] == typdelim:
+                if parse_state not in (APS_ELEM_STARTED, APS_STRIDE_DONE):
+                    raise _UnexpectedCharacter(array_text, ptr)
+
+                if parse_state == APS_STRIDE_DONE:
+                    parse_state = APS_STRIDE_DELIMITED
+                else:
+                    parse_state = APS_ELEM_DELIMITED
+                end_of_item = True
+                stride_len[nest_level - 1] += 1
+
+            elif not apg_ascii_isspace(ptr[0]):
+                if parse_state not in (APS_STRIDE_STARTED,
+                                       APS_ELEM_STARTED,
+                                       APS_ELEM_DELIMITED):
+                    raise _UnexpectedCharacter(array_text, ptr)
+
+                parse_state = APS_ELEM_STARTED
+                array_is_empty = False
+
+            if not end_of_item:
+                ptr += 1
+
+        if not array_is_empty:
+            dims[ndims[0] - 1] += 1
+
+        ptr += 1
+
+    # only whitespace is allowed after the closing brace
+    while ptr[0] != '\0':
+        if not apg_ascii_isspace(ptr[0]):
+            raise _UnexpectedCharacter(array_text, ptr)
+
+        ptr += 1
+
+    if array_is_empty:
+        ndims[0] = 0
+
+
+cdef uint4_encode_ex(ConnectionSettings settings, WriteBuffer buf, object obj,
+                     const void *arg):
+    return pgproto.uint4_encode(settings, buf, obj)
+
+
+cdef uint4_decode_ex(ConnectionSettings settings, FRBuffer *buf,
+                     const void *arg):
+    return pgproto.uint4_decode(settings, buf)
+
+
+cdef arrayoid_encode(ConnectionSettings settings, WriteBuffer buf, items):
+    array_encode(settings, buf, items, OIDOID,
+                 <encode_func_ex>&uint4_encode_ex, NULL)
+
+
+cdef arrayoid_decode(ConnectionSettings settings, FRBuffer *buf):
+    return array_decode(settings, buf, <decode_func_ex>&uint4_decode_ex, NULL)
+
+
+cdef text_encode_ex(ConnectionSettings settings, WriteBuffer buf, object obj,
+                    const void *arg):
+    return pgproto.text_encode(settings, buf, obj)
+
+
+cdef text_decode_ex(ConnectionSettings settings, FRBuffer *buf,
+                    const void *arg):
+    return pgproto.text_decode(settings, buf)
+
+
+cdef arraytext_encode(ConnectionSettings settings, WriteBuffer buf, items):
+    array_encode(settings, buf, items, TEXTOID,
+                 <encode_func_ex>&text_encode_ex, NULL)
+
+
+cdef arraytext_decode(ConnectionSettings settings, FRBuffer *buf):
+    return array_decode(settings, buf, <decode_func_ex>&text_decode_ex, NULL)
+
+
+cdef init_array_codecs():
+    # oid[] and text[] are registered as core codecs
+    # to make type introspection query work
+    #
+    register_core_codec(_OIDOID,
+                        <encode_func>&arrayoid_encode,
+                        <decode_func>&arrayoid_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(_TEXTOID,
+                        <encode_func>&arraytext_encode,
+                        <decode_func>&arraytext_decode,
+                        PG_FORMAT_BINARY)
+
+init_array_codecs()

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/codecs/base.pxd

@@ -0,0 +1,199 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+ctypedef object (*encode_func)(ConnectionSettings settings,
+                               WriteBuffer buf,
+                               object obj)
+
+ctypedef object (*decode_func)(ConnectionSettings settings,
+                               FRBuffer *buf)
+
+ctypedef object (*codec_encode_func)(Codec codec,
+                                     ConnectionSettings settings,
+                                     WriteBuffer buf,
+                                     object obj)
+
+ctypedef object (*codec_decode_func)(Codec codec,
+                                     ConnectionSettings settings,
+                                     FRBuffer *buf)
+
+
+cdef class CodecMap:
+    cdef:
+        void** binary_codec_map
+        void** text_codec_map
+        dict extra_codecs
+
+    cdef inline void *get_binary_codec_ptr(self, uint32_t idx)
+    cdef inline void set_binary_codec_ptr(self, uint32_t idx, void *ptr)
+    cdef inline void *get_text_codec_ptr(self, uint32_t idx)
+    cdef inline void set_text_codec_ptr(self, uint32_t idx, void *ptr)
+
+
+cdef enum CodecType:
+    CODEC_UNDEFINED  = 0
+    CODEC_C          = 1
+    CODEC_PY         = 2
+    CODEC_ARRAY      = 3
+    CODEC_COMPOSITE  = 4
+    CODEC_RANGE      = 5
+    CODEC_MULTIRANGE = 6
+
+
+cdef enum ServerDataFormat:
+    PG_FORMAT_ANY = -1
+    PG_FORMAT_TEXT = 0
+    PG_FORMAT_BINARY = 1
+
+
+cdef enum ClientExchangeFormat:
+    PG_XFORMAT_OBJECT = 1
+    PG_XFORMAT_TUPLE = 2
+
+
+cdef class Codec:
+    cdef:
+        uint32_t        oid
+
+        str             name
+        str             schema
+        str             kind
+
+        CodecType       type
+        ServerDataFormat format
+        ClientExchangeFormat xformat
+
+        encode_func     c_encoder
+        decode_func     c_decoder
+        Codec           base_codec
+
+        object          py_encoder
+        object          py_decoder
+
+        # arrays
+        Codec           element_codec
+        Py_UCS4         element_delimiter
+
+        # composite types
+        tuple           element_type_oids
+        object          element_names
+        object          record_desc
+        list            element_codecs
+
+        # Pointers to actual encoder/decoder functions for this codec
+        codec_encode_func encoder
+        codec_decode_func decoder
+
+    cdef init(self, str name, str schema, str kind,
+              CodecType type, ServerDataFormat format,
+              ClientExchangeFormat xformat,
+              encode_func c_encoder, decode_func c_decoder,
+              Codec base_codec,
+              object py_encoder, object py_decoder,
+              Codec element_codec, tuple element_type_oids,
+              object element_names, list element_codecs,
+              Py_UCS4 element_delimiter)
+
+    cdef encode_scalar(self, ConnectionSettings settings, WriteBuffer buf,
+                       object obj)
+
+    cdef encode_array(self, ConnectionSettings settings, WriteBuffer buf,
+                      object obj)
+
+    cdef encode_array_text(self, ConnectionSettings settings, WriteBuffer buf,
+                           object obj)
+
+    cdef encode_range(self, ConnectionSettings settings, WriteBuffer buf,
+                      object obj)
+
+    cdef encode_multirange(self, ConnectionSettings settings, WriteBuffer buf,
+                           object obj)
+
+    cdef encode_composite(self, ConnectionSettings settings, WriteBuffer buf,
+                          object obj)
+
+    cdef encode_in_python(self, ConnectionSettings settings, WriteBuffer buf,
+                          object obj)
+
+    cdef decode_scalar(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef decode_array(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef decode_array_text(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef decode_range(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef decode_multirange(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef decode_composite(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef decode_in_python(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef inline encode(self,
+                       ConnectionSettings settings,
+                       WriteBuffer buf,
+                       object obj)
+
+    cdef inline decode(self, ConnectionSettings settings, FRBuffer *buf)
+
+    cdef has_encoder(self)
+    cdef has_decoder(self)
+    cdef is_binary(self)
+
+    cdef inline Codec copy(self)
+
+    @staticmethod
+    cdef Codec new_array_codec(uint32_t oid,
+                               str name,
+                               str schema,
+                               Codec element_codec,
+                               Py_UCS4 element_delimiter)
+
+    @staticmethod
+    cdef Codec new_range_codec(uint32_t oid,
+                               str name,
+                               str schema,
+                               Codec element_codec)
+
+    @staticmethod
+    cdef Codec new_multirange_codec(uint32_t oid,
+                                    str name,
+                                    str schema,
+                                    Codec element_codec)
+
+    @staticmethod
+    cdef Codec new_composite_codec(uint32_t oid,
+                                   str name,
+                                   str schema,
+                                   ServerDataFormat format,
+                                   list element_codecs,
+                                   tuple element_type_oids,
+                                   object element_names)
+
+    @staticmethod
+    cdef Codec new_python_codec(uint32_t oid,
+                                str name,
+                                str schema,
+                                str kind,
+                                object encoder,
+                                object decoder,
+                                encode_func c_encoder,
+                                decode_func c_decoder,
+                                Codec base_codec,
+                                ServerDataFormat format,
+                                ClientExchangeFormat xformat)
+
+
+cdef class DataCodecConfig:
+    cdef:
+        dict _derived_type_codecs
+        dict _custom_type_codecs
+
+    cdef inline Codec get_codec(self, uint32_t oid, ServerDataFormat format,
+                                bint ignore_custom_codec=*)
+    cdef inline Codec get_custom_codec(self, uint32_t oid,
+                                       ServerDataFormat format)

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/codecs/base.pyx

@@ -0,0 +1,922 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from collections.abc import Mapping as MappingABC
+
+import asyncpg
+from asyncpg import exceptions
+
+
+# The class indirection is needed because Cython
+# does not (as of 3.1.0) store global cdef variables
+# in module state.
+@cython.final
+cdef class CodecMap:
+
+    def __cinit__(self):
+        self.extra_codecs = {}
+        self.binary_codec_map = <void **>cpython.PyMem_Calloc(
+            (MAXSUPPORTEDOID + 1) * 2, sizeof(void *))
+        self.text_codec_map = <void **>cpython.PyMem_Calloc(
+            (MAXSUPPORTEDOID + 1) * 2, sizeof(void *))
+
+    cdef inline void *get_binary_codec_ptr(self, uint32_t idx):
+        return <void*>self.binary_codec_map[idx]
+
+    cdef inline void set_binary_codec_ptr(self, uint32_t idx, void *ptr):
+        self.binary_codec_map[idx] = ptr
+
+    cdef inline void *get_text_codec_ptr(self, uint32_t idx):
+        return <void*>self.text_codec_map[idx]
+
+    cdef inline void set_text_codec_ptr(self, uint32_t idx, void *ptr):
+        self.text_codec_map[idx] = ptr
+
+
+codec_map = CodecMap()
+
+
+@cython.final
+cdef class Codec:
+
+    def __cinit__(self, uint32_t oid):
+        self.oid = oid
+        self.type = CODEC_UNDEFINED
+
+    cdef init(
+        self,
+        str name,
+        str schema,
+        str kind,
+        CodecType type,
+        ServerDataFormat format,
+        ClientExchangeFormat xformat,
+        encode_func c_encoder,
+        decode_func c_decoder,
+        Codec base_codec,
+        object py_encoder,
+        object py_decoder,
+        Codec element_codec,
+        tuple element_type_oids,
+        object element_names,
+        list element_codecs,
+        Py_UCS4 element_delimiter,
+    ):
+
+        self.name = name
+        self.schema = schema
+        self.kind = kind
+        self.type = type
+        self.format = format
+        self.xformat = xformat
+        self.c_encoder = c_encoder
+        self.c_decoder = c_decoder
+        self.base_codec = base_codec
+        self.py_encoder = py_encoder
+        self.py_decoder = py_decoder
+        self.element_codec = element_codec
+        self.element_type_oids = element_type_oids
+        self.element_codecs = element_codecs
+        self.element_delimiter = element_delimiter
+        self.element_names = element_names
+
+        if base_codec is not None:
+            if c_encoder != NULL or c_decoder != NULL:
+                raise exceptions.InternalClientError(
+                    'base_codec is mutually exclusive with c_encoder/c_decoder'
+                )
+
+        if element_names is not None:
+            self.record_desc = RecordDescriptor(
+                element_names, tuple(element_names))
+        else:
+            self.record_desc = None
+
+        if type == CODEC_C:
+            self.encoder = <codec_encode_func>&self.encode_scalar
+            self.decoder = <codec_decode_func>&self.decode_scalar
+        elif type == CODEC_ARRAY:
+            if format == PG_FORMAT_BINARY:
+                self.encoder = <codec_encode_func>&self.encode_array
+                self.decoder = <codec_decode_func>&self.decode_array
+            else:
+                self.encoder = <codec_encode_func>&self.encode_array_text
+                self.decoder = <codec_decode_func>&self.decode_array_text
+        elif type == CODEC_RANGE:
+            if format != PG_FORMAT_BINARY:
+                raise exceptions.UnsupportedClientFeatureError(
+                    'cannot decode type "{}"."{}": text encoding of '
+                    'range types is not supported'.format(schema, name))
+            self.encoder = <codec_encode_func>&self.encode_range
+            self.decoder = <codec_decode_func>&self.decode_range
+        elif type == CODEC_MULTIRANGE:
+            if format != PG_FORMAT_BINARY:
+                raise exceptions.UnsupportedClientFeatureError(
+                    'cannot decode type "{}"."{}": text encoding of '
+                    'range types is not supported'.format(schema, name))
+            self.encoder = <codec_encode_func>&self.encode_multirange
+            self.decoder = <codec_decode_func>&self.decode_multirange
+        elif type == CODEC_COMPOSITE:
+            if format != PG_FORMAT_BINARY:
+                raise exceptions.UnsupportedClientFeatureError(
+                    'cannot decode type "{}"."{}": text encoding of '
+                    'composite types is not supported'.format(schema, name))
+            self.encoder = <codec_encode_func>&self.encode_composite
+            self.decoder = <codec_decode_func>&self.decode_composite
+        elif type == CODEC_PY:
+            self.encoder = <codec_encode_func>&self.encode_in_python
+            self.decoder = <codec_decode_func>&self.decode_in_python
+        else:
+            raise exceptions.InternalClientError(
+                'unexpected codec type: {}'.format(type))
+
+    cdef Codec copy(self):
+        cdef Codec codec
+
+        codec = Codec(self.oid)
+        codec.init(self.name, self.schema, self.kind,
+                   self.type, self.format, self.xformat,
+                   self.c_encoder, self.c_decoder, self.base_codec,
+                   self.py_encoder, self.py_decoder,
+                   self.element_codec,
+                   self.element_type_oids, self.element_names,
+                   self.element_codecs, self.element_delimiter)
+
+        return codec
+
+    cdef encode_scalar(self, ConnectionSettings settings, WriteBuffer buf,
+                       object obj):
+        self.c_encoder(settings, buf, obj)
+
+    cdef encode_array(self, ConnectionSettings settings, WriteBuffer buf,
+                      object obj):
+        array_encode(settings, buf, obj, self.element_codec.oid,
+                     codec_encode_func_ex,
+                     <void*>(<cpython.PyObject>self.element_codec))
+
+    cdef encode_array_text(self, ConnectionSettings settings, WriteBuffer buf,
+                           object obj):
+        return textarray_encode(settings, buf, obj,
+                                codec_encode_func_ex,
+                                <void*>(<cpython.PyObject>self.element_codec),
+                                self.element_delimiter)
+
+    cdef encode_range(self, ConnectionSettings settings, WriteBuffer buf,
+                      object obj):
+        range_encode(settings, buf, obj, self.element_codec.oid,
+                     codec_encode_func_ex,
+                     <void*>(<cpython.PyObject>self.element_codec))
+
+    cdef encode_multirange(self, ConnectionSettings settings, WriteBuffer buf,
+                           object obj):
+        multirange_encode(settings, buf, obj, self.element_codec.oid,
+                          codec_encode_func_ex,
+                          <void*>(<cpython.PyObject>self.element_codec))
+
+    cdef encode_composite(self, ConnectionSettings settings, WriteBuffer buf,
+                          object obj):
+        cdef:
+            WriteBuffer elem_data
+            int i
+            list elem_codecs = self.element_codecs
+            ssize_t count
+            ssize_t composite_size
+            tuple rec
+
+        if isinstance(obj, MappingABC):
+            # Input is dict-like, form a tuple
+            composite_size = len(self.element_type_oids)
+            rec = cpython.PyTuple_New(composite_size)
+
+            for i in range(composite_size):
+                cpython.Py_INCREF(None)
+                cpython.PyTuple_SET_ITEM(rec, i, None)
+
+            for field in obj:
+                try:
+                    i = self.element_names[field]
+                except KeyError:
+                    raise ValueError(
+                        '{!r} is not a valid element of composite '
+                        'type {}'.format(field, self.name)) from None
+
+                item = obj[field]
+                cpython.Py_INCREF(item)
+                cpython.PyTuple_SET_ITEM(rec, i, item)
+
+            obj = rec
+
+        count = len(obj)
+        if count > _MAXINT32:
+            raise ValueError('too many elements in composite type record')
+
+        elem_data = WriteBuffer.new()
+        i = 0
+        for item in obj:
+            elem_data.write_int32(<int32_t>self.element_type_oids[i])
+            if item is None:
+                elem_data.write_int32(-1)
+            else:
+                (<Codec>elem_codecs[i]).encode(settings, elem_data, item)
+            i += 1
+
+        record_encode_frame(settings, buf, elem_data, <int32_t>count)
+
+    cdef encode_in_python(self, ConnectionSettings settings, WriteBuffer buf,
+                          object obj):
+        data = self.py_encoder(obj)
+        if self.xformat == PG_XFORMAT_OBJECT:
+            if self.format == PG_FORMAT_BINARY:
+                pgproto.bytea_encode(settings, buf, data)
+            elif self.format == PG_FORMAT_TEXT:
+                pgproto.text_encode(settings, buf, data)
+            else:
+                raise exceptions.InternalClientError(
+                    'unexpected data format: {}'.format(self.format))
+        elif self.xformat == PG_XFORMAT_TUPLE:
+            if self.base_codec is not None:
+                self.base_codec.encode(settings, buf, data)
+            else:
+                self.c_encoder(settings, buf, data)
+        else:
+            raise exceptions.InternalClientError(
+                'unexpected exchange format: {}'.format(self.xformat))
+
+    cdef encode(self, ConnectionSettings settings, WriteBuffer buf,
+                object obj):
+        return self.encoder(self, settings, buf, obj)
+
+    cdef decode_scalar(self, ConnectionSettings settings, FRBuffer *buf):
+        return self.c_decoder(settings, buf)
+
+    cdef decode_array(self, ConnectionSettings settings, FRBuffer *buf):
+        return array_decode(settings, buf, codec_decode_func_ex,
+                            <void*>(<cpython.PyObject>self.element_codec))
+
+    cdef decode_array_text(self, ConnectionSettings settings,
+                           FRBuffer *buf):
+        return textarray_decode(settings, buf, codec_decode_func_ex,
+                                <void*>(<cpython.PyObject>self.element_codec),
+                                self.element_delimiter)
+
+    cdef decode_range(self, ConnectionSettings settings, FRBuffer *buf):
+        return range_decode(settings, buf, codec_decode_func_ex,
+                            <void*>(<cpython.PyObject>self.element_codec))
+
+    cdef decode_multirange(self, ConnectionSettings settings, FRBuffer *buf):
+        return multirange_decode(settings, buf, codec_decode_func_ex,
+                                 <void*>(<cpython.PyObject>self.element_codec))
+
+    cdef decode_composite(self, ConnectionSettings settings,
+                          FRBuffer *buf):
+        cdef:
+            object result
+            ssize_t elem_count
+            ssize_t i
+            int32_t elem_len
+            uint32_t elem_typ
+            uint32_t received_elem_typ
+            Codec elem_codec
+            FRBuffer elem_buf
+
+        elem_count = <ssize_t><uint32_t>hton.unpack_int32(frb_read(buf, 4))
+        if elem_count != len(self.element_type_oids):
+            raise exceptions.OutdatedSchemaCacheError(
+                'unexpected number of attributes of composite type: '
+                '{}, expected {}'
+                    .format(
+                        elem_count,
+                        len(self.element_type_oids),
+                    ),
+                schema=self.schema,
+                data_type=self.name,
+            )
+        result = self.record_desc.make_record(asyncpg.Record, elem_count)
+        for i in range(elem_count):
+            elem_typ = self.element_type_oids[i]
+            received_elem_typ = <uint32_t>hton.unpack_int32(frb_read(buf, 4))
+
+            if received_elem_typ != elem_typ:
+                raise exceptions.OutdatedSchemaCacheError(
+                    'unexpected data type of composite type attribute {}: '
+                    '{!r}, expected {!r}'
+                        .format(
+                            i,
+                            BUILTIN_TYPE_OID_MAP.get(
+                                received_elem_typ, received_elem_typ),
+                            BUILTIN_TYPE_OID_MAP.get(
+                                elem_typ, elem_typ)
+                        ),
+                    schema=self.schema,
+                    data_type=self.name,
+                    position=i,
+                )
+
+            elem_len = hton.unpack_int32(frb_read(buf, 4))
+            if elem_len == -1:
+                elem = None
+            else:
+                elem_codec = self.element_codecs[i]
+                elem = elem_codec.decode(
+                    settings, frb_slice_from(&elem_buf, buf, elem_len))
+
+            cpython.Py_INCREF(elem)
+            recordcapi.ApgRecord_SET_ITEM(result, i, elem)
+
+        return result
+
+    cdef decode_in_python(self, ConnectionSettings settings,
+                          FRBuffer *buf):
+        if self.xformat == PG_XFORMAT_OBJECT:
+            if self.format == PG_FORMAT_BINARY:
+                data = pgproto.bytea_decode(settings, buf)
+            elif self.format == PG_FORMAT_TEXT:
+                data = pgproto.text_decode(settings, buf)
+            else:
+                raise exceptions.InternalClientError(
+                    'unexpected data format: {}'.format(self.format))
+        elif self.xformat == PG_XFORMAT_TUPLE:
+            if self.base_codec is not None:
+                data = self.base_codec.decode(settings, buf)
+            else:
+                data = self.c_decoder(settings, buf)
+        else:
+            raise exceptions.InternalClientError(
+                'unexpected exchange format: {}'.format(self.xformat))
+
+        return self.py_decoder(data)
+
+    cdef inline decode(self, ConnectionSettings settings, FRBuffer *buf):
+        return self.decoder(self, settings, buf)
+
+    cdef inline has_encoder(self):
+        cdef Codec elem_codec
+
+        if self.c_encoder is not NULL or self.py_encoder is not None:
+            return True
+
+        elif (
+            self.type == CODEC_ARRAY
+            or self.type == CODEC_RANGE
+            or self.type == CODEC_MULTIRANGE
+        ):
+            return self.element_codec.has_encoder()
+
+        elif self.type == CODEC_COMPOSITE:
+            for elem_codec in self.element_codecs:
+                if not elem_codec.has_encoder():
+                    return False
+            return True
+
+        else:
+            return False
+
+    cdef has_decoder(self):
+        cdef Codec elem_codec
+
+        if self.c_decoder is not NULL or self.py_decoder is not None:
+            return True
+
+        elif (
+            self.type == CODEC_ARRAY
+            or self.type == CODEC_RANGE
+            or self.type == CODEC_MULTIRANGE
+        ):
+            return self.element_codec.has_decoder()
+
+        elif self.type == CODEC_COMPOSITE:
+            for elem_codec in self.element_codecs:
+                if not elem_codec.has_decoder():
+                    return False
+            return True
+
+        else:
+            return False
+
+    cdef is_binary(self):
+        return self.format == PG_FORMAT_BINARY
+
+    def __repr__(self):
+        return '<Codec oid={} elem_oid={} core={}>'.format(
+            self.oid,
+            'NA' if self.element_codec is None else self.element_codec.oid,
+            has_core_codec(self.oid))
+
+    @staticmethod
+    cdef Codec new_array_codec(uint32_t oid,
+                               str name,
+                               str schema,
+                               Codec element_codec,
+                               Py_UCS4 element_delimiter):
+        cdef Codec codec
+        codec = Codec(oid)
+        codec.init(name, schema, 'array', CODEC_ARRAY, element_codec.format,
+                   PG_XFORMAT_OBJECT, NULL, NULL, None, None, None,
+                   element_codec, None, None, None, element_delimiter)
+        return codec
+
+    @staticmethod
+    cdef Codec new_range_codec(uint32_t oid,
+                               str name,
+                               str schema,
+                               Codec element_codec):
+        cdef Codec codec
+        codec = Codec(oid)
+        codec.init(name, schema, 'range', CODEC_RANGE, element_codec.format,
+                   PG_XFORMAT_OBJECT, NULL, NULL, None, None, None,
+                   element_codec, None, None, None, 0)
+        return codec
+
+    @staticmethod
+    cdef Codec new_multirange_codec(uint32_t oid,
+                                    str name,
+                                    str schema,
+                                    Codec element_codec):
+        cdef Codec codec
+        codec = Codec(oid)
+        codec.init(name, schema, 'multirange', CODEC_MULTIRANGE,
+                   element_codec.format, PG_XFORMAT_OBJECT, NULL, NULL, None,
+                   None, None, element_codec, None, None, None, 0)
+        return codec
+
+    @staticmethod
+    cdef Codec new_composite_codec(uint32_t oid,
+                                   str name,
+                                   str schema,
+                                   ServerDataFormat format,
+                                   list element_codecs,
+                                   tuple element_type_oids,
+                                   object element_names):
+        cdef Codec codec
+        codec = Codec(oid)
+        codec.init(name, schema, 'composite', CODEC_COMPOSITE,
+                   format, PG_XFORMAT_OBJECT, NULL, NULL, None, None, None,
+                   None, element_type_oids, element_names, element_codecs, 0)
+        return codec
+
+    @staticmethod
+    cdef Codec new_python_codec(uint32_t oid,
+                                str name,
+                                str schema,
+                                str kind,
+                                object encoder,
+                                object decoder,
+                                encode_func c_encoder,
+                                decode_func c_decoder,
+                                Codec base_codec,
+                                ServerDataFormat format,
+                                ClientExchangeFormat xformat):
+        cdef Codec codec
+        codec = Codec(oid)
+        codec.init(name, schema, kind, CODEC_PY, format, xformat,
+                   c_encoder, c_decoder, base_codec, encoder, decoder,
+                   None, None, None, None, 0)
+        return codec
+
+
+# Encode callback for arrays
+cdef codec_encode_func_ex(ConnectionSettings settings, WriteBuffer buf,
+                          object obj, const void *arg):
+    return (<Codec>arg).encode(settings, buf, obj)
+
+
+# Decode callback for arrays
+cdef codec_decode_func_ex(ConnectionSettings settings, FRBuffer *buf,
+                          const void *arg):
+    return (<Codec>arg).decode(settings, buf)
+
+
+cdef uint32_t pylong_as_oid(val) except? 0xFFFFFFFFl:
+    cdef:
+        int64_t oid = 0
+        bint overflow = False
+
+    try:
+        oid = cpython.PyLong_AsLongLong(val)
+    except OverflowError:
+        overflow = True
+
+    if overflow or (oid < 0 or oid > UINT32_MAX):
+        raise OverflowError('OID value too large: {!r}'.format(val))
+
+    return <uint32_t>val
+
+
+cdef class DataCodecConfig:
+    def __init__(self):
+        # Codec instance cache for derived types:
+        # composites, arrays, ranges, domains and their combinations.
+        self._derived_type_codecs = {}
+        # Codec instances set up by the user for the connection.
+        self._custom_type_codecs = {}
+
+    def add_types(self, types):
+        cdef:
+            Codec elem_codec
+            list comp_elem_codecs
+            ServerDataFormat format
+            ServerDataFormat elem_format
+            bint has_text_elements
+            Py_UCS4 elem_delim
+
+        for ti in types:
+            oid = ti['oid']
+
+            if self.get_codec(oid, PG_FORMAT_ANY) is not None:
+                continue
+
+            name = ti['name']
+            schema = ti['ns']
+            array_element_oid = ti['elemtype']
+            range_subtype_oid = ti['range_subtype']
+            if ti['attrtypoids']:
+                comp_type_attrs = tuple(ti['attrtypoids'])
+            else:
+                comp_type_attrs = None
+            base_type = ti['basetype']
+
+            if array_element_oid:
+                # Array type (note, there is no separate 'kind' for arrays)
+
+                # Canonicalize type name to "elemtype[]"
+                if name.startswith('_'):
+                    name = name[1:]
+                name = '{}[]'.format(name)
+
+                elem_codec = self.get_codec(array_element_oid, PG_FORMAT_ANY)
+                if elem_codec is None:
+                    elem_codec = self.declare_fallback_codec(
+                        array_element_oid, ti['elemtype_name'], schema)
+
+                elem_delim = <Py_UCS4>ti['elemdelim'][0]
+
+                self._derived_type_codecs[oid, elem_codec.format] = \
+                    Codec.new_array_codec(
+                        oid, name, schema, elem_codec, elem_delim)
+
+            elif ti['kind'] == b'c':
+                # Composite type
+
+                if not comp_type_attrs:
+                    raise exceptions.InternalClientError(
+                        f'type record missing field types for composite {oid}')
+
+                comp_elem_codecs = []
+                has_text_elements = False
+
+                for typoid in comp_type_attrs:
+                    elem_codec = self.get_codec(typoid, PG_FORMAT_ANY)
+                    if elem_codec is None:
+                        raise exceptions.InternalClientError(
+                            f'no codec for composite attribute type {typoid}')
+                    if elem_codec.format is PG_FORMAT_TEXT:
+                        has_text_elements = True
+                    comp_elem_codecs.append(elem_codec)
+
+                element_names = collections.OrderedDict()
+                for i, attrname in enumerate(ti['attrnames']):
+                    element_names[attrname] = i
+
+                # If at least one element is text-encoded, we must
+                # encode the whole composite as text.
+                if has_text_elements:
+                    elem_format = PG_FORMAT_TEXT
+                else:
+                    elem_format = PG_FORMAT_BINARY
+
+                self._derived_type_codecs[oid, elem_format] = \
+                    Codec.new_composite_codec(
+                        oid, name, schema, elem_format, comp_elem_codecs,
+                        comp_type_attrs, element_names)
+
+            elif ti['kind'] == b'd':
+                # Domain type
+
+                if not base_type:
+                    raise exceptions.InternalClientError(
+                        f'type record missing base type for domain {oid}')
+
+                elem_codec = self.get_codec(base_type, PG_FORMAT_ANY)
+                if elem_codec is None:
+                    elem_codec = self.declare_fallback_codec(
+                        base_type, ti['basetype_name'], schema)
+
+                self._derived_type_codecs[oid, elem_codec.format] = elem_codec
+
+            elif ti['kind'] == b'r':
+                # Range type
+
+                if not range_subtype_oid:
+                    raise exceptions.InternalClientError(
+                        f'type record missing base type for range {oid}')
+
+                elem_codec = self.get_codec(range_subtype_oid, PG_FORMAT_ANY)
+                if elem_codec is None:
+                    elem_codec = self.declare_fallback_codec(
+                        range_subtype_oid, ti['range_subtype_name'], schema)
+
+                self._derived_type_codecs[oid, elem_codec.format] = \
+                    Codec.new_range_codec(oid, name, schema, elem_codec)
+
+            elif ti['kind'] == b'm':
+                # Multirange type
+
+                if not range_subtype_oid:
+                    raise exceptions.InternalClientError(
+                        f'type record missing base type for multirange {oid}')
+
+                elem_codec = self.get_codec(range_subtype_oid, PG_FORMAT_ANY)
+                if elem_codec is None:
+                    elem_codec = self.declare_fallback_codec(
+                        range_subtype_oid, ti['range_subtype_name'], schema)
+
+                self._derived_type_codecs[oid, elem_codec.format] = \
+                    Codec.new_multirange_codec(oid, name, schema, elem_codec)
+
+            elif ti['kind'] == b'e':
+                # Enum types are essentially text
+                self._set_builtin_type_codec(oid, name, schema, 'scalar',
+                                             TEXTOID, PG_FORMAT_ANY)
+            else:
+                self.declare_fallback_codec(oid, name, schema)
+
+    def add_python_codec(self, typeoid, typename, typeschema, typekind,
+                         typeinfos, encoder, decoder, format, xformat):
+        cdef:
+            Codec core_codec = None
+            encode_func c_encoder = NULL
+            decode_func c_decoder = NULL
+            Codec base_codec = None
+            uint32_t oid = pylong_as_oid(typeoid)
+            bint codec_set = False
+
+        # Clear all previous overrides (this also clears type cache).
+        self.remove_python_codec(typeoid, typename, typeschema)
+
+        if typeinfos:
+            self.add_types(typeinfos)
+
+        if format == PG_FORMAT_ANY:
+            formats = (PG_FORMAT_TEXT, PG_FORMAT_BINARY)
+        else:
+            formats = (format,)
+
+        for fmt in formats:
+            if xformat == PG_XFORMAT_TUPLE:
+                if typekind == "scalar":
+                    core_codec = get_core_codec(oid, fmt, xformat)
+                    if core_codec is None:
+                        continue
+                    c_encoder = core_codec.c_encoder
+                    c_decoder = core_codec.c_decoder
+                elif typekind == "composite":
+                    base_codec = self.get_codec(oid, fmt)
+                    if base_codec is None:
+                        continue
+
+            self._custom_type_codecs[typeoid, fmt] = \
+                Codec.new_python_codec(oid, typename, typeschema, typekind,
+                                       encoder, decoder, c_encoder, c_decoder,
+                                       base_codec, fmt, xformat)
+            codec_set = True
+
+        if not codec_set:
+            raise exceptions.InterfaceError(
+                "{} type does not support the 'tuple' exchange format".format(
+                    typename))
+
+    def remove_python_codec(self, typeoid, typename, typeschema):
+        for fmt in (PG_FORMAT_BINARY, PG_FORMAT_TEXT):
+            self._custom_type_codecs.pop((typeoid, fmt), None)
+        self.clear_type_cache()
+
+    def _set_builtin_type_codec(self, typeoid, typename, typeschema, typekind,
+                                alias_to, format=PG_FORMAT_ANY):
+        cdef:
+            Codec codec
+            Codec target_codec
+            uint32_t oid = pylong_as_oid(typeoid)
+            uint32_t alias_oid = 0
+            bint codec_set = False
+
+        if format == PG_FORMAT_ANY:
+            formats = (PG_FORMAT_BINARY, PG_FORMAT_TEXT)
+        else:
+            formats = (format,)
+
+        if isinstance(alias_to, int):
+            alias_oid = pylong_as_oid(alias_to)
+        else:
+            alias_oid = BUILTIN_TYPE_NAME_MAP.get(alias_to, 0)
+
+        for format in formats:
+            if alias_oid != 0:
+                target_codec = self.get_codec(alias_oid, format)
+            else:
+                target_codec = get_extra_codec(alias_to, format)
+
+            if target_codec is None:
+                continue
+
+            codec = target_codec.copy()
+            codec.oid = typeoid
+            codec.name = typename
+            codec.schema = typeschema
+            codec.kind = typekind
+
+            self._custom_type_codecs[typeoid, format] = codec
+            codec_set = True
+
+        if not codec_set:
+            if format == PG_FORMAT_BINARY:
+                codec_str = 'binary'
+            elif format == PG_FORMAT_TEXT:
+                codec_str = 'text'
+            else:
+                codec_str = 'text or binary'
+
+            raise exceptions.InterfaceError(
+                f'cannot alias {typename} to {alias_to}: '
+                f'there is no {codec_str} codec for {alias_to}')
+
+    def set_builtin_type_codec(self, typeoid, typename, typeschema, typekind,
+                               alias_to, format=PG_FORMAT_ANY):
+        self._set_builtin_type_codec(typeoid, typename, typeschema, typekind,
+                                     alias_to, format)
+        self.clear_type_cache()
+
+    def clear_type_cache(self):
+        self._derived_type_codecs.clear()
+
+    def declare_fallback_codec(self, uint32_t oid, str name, str schema):
+        cdef Codec codec
+
+        if oid <= MAXBUILTINOID:
+            # This is a BKI type, for which asyncpg has no
+            # defined codec.  This should only happen for newly
+            # added builtin types, for which this version of
+            # asyncpg is lacking support.
+            #
+            raise exceptions.UnsupportedClientFeatureError(
+                f'unhandled standard data type {name!r} (OID {oid})')
+        else:
+            # This is a non-BKI type, and as such, has no
+            # stable OID, so no possibility of a builtin codec.
+            # In this case, fallback to text format.  Applications
+            # can avoid this by specifying a codec for this type
+            # using Connection.set_type_codec().
+            #
+            self._set_builtin_type_codec(oid, name, schema, 'scalar',
+                                         TEXTOID, PG_FORMAT_TEXT)
+
+            codec = self.get_codec(oid, PG_FORMAT_TEXT)
+
+        return codec
+
+    cdef inline Codec get_codec(self, uint32_t oid, ServerDataFormat format,
+                                bint ignore_custom_codec=False):
+        cdef Codec codec
+
+        if format == PG_FORMAT_ANY:
+            codec = self.get_codec(
+                oid, PG_FORMAT_BINARY, ignore_custom_codec)
+            if codec is None:
+                codec = self.get_codec(
+                    oid, PG_FORMAT_TEXT, ignore_custom_codec)
+            return codec
+        else:
+            if not ignore_custom_codec:
+                codec = self.get_custom_codec(oid, PG_FORMAT_ANY)
+                if codec is not None:
+                    if codec.format != format:
+                        # The codec for this OID has been overridden by
+                        # set_{builtin}_type_codec with a different format.
+                        # We must respect that and not return a core codec.
+                        return None
+                    else:
+                        return codec
+
+            codec = get_core_codec(oid, format)
+            if codec is not None:
+                return codec
+            else:
+                try:
+                    return self._derived_type_codecs[oid, format]
+                except KeyError:
+                    return None
+
+    cdef inline Codec get_custom_codec(
+        self,
+        uint32_t oid,
+        ServerDataFormat format
+    ):
+        cdef Codec codec
+
+        if format == PG_FORMAT_ANY:
+            codec = self.get_custom_codec(oid, PG_FORMAT_BINARY)
+            if codec is None:
+                codec = self.get_custom_codec(oid, PG_FORMAT_TEXT)
+        else:
+            codec = self._custom_type_codecs.get((oid, format))
+
+        return codec
+
+
+cdef inline Codec get_core_codec(
+        uint32_t oid, ServerDataFormat format,
+        ClientExchangeFormat xformat=PG_XFORMAT_OBJECT):
+    cdef:
+        void *ptr = NULL
+
+    if oid > MAXSUPPORTEDOID:
+        return None
+    if format == PG_FORMAT_BINARY:
+        ptr = (<CodecMap>codec_map).get_binary_codec_ptr(oid * xformat)
+    elif format == PG_FORMAT_TEXT:
+        ptr = (<CodecMap>codec_map).get_text_codec_ptr(oid * xformat)
+
+    if ptr is NULL:
+        return None
+    else:
+        return <Codec>ptr
+
+
+cdef inline Codec get_any_core_codec(
+        uint32_t oid, ServerDataFormat format,
+        ClientExchangeFormat xformat=PG_XFORMAT_OBJECT):
+    """A version of get_core_codec that accepts PG_FORMAT_ANY."""
+    cdef:
+        Codec codec
+
+    if format == PG_FORMAT_ANY:
+        codec = get_core_codec(oid, PG_FORMAT_BINARY, xformat)
+        if codec is None:
+            codec = get_core_codec(oid, PG_FORMAT_TEXT, xformat)
+    else:
+        codec = get_core_codec(oid, format, xformat)
+
+    return codec
+
+
+cdef inline int has_core_codec(uint32_t oid):
+    return (
+        (<CodecMap>codec_map).get_binary_codec_ptr(oid) != NULL
+        or (<CodecMap>codec_map).get_text_codec_ptr(oid) != NULL
+    )
+
+
+cdef register_core_codec(uint32_t oid,
+                         encode_func encode,
+                         decode_func decode,
+                         ServerDataFormat format,
+                         ClientExchangeFormat xformat=PG_XFORMAT_OBJECT):
+
+    if oid > MAXSUPPORTEDOID:
+        raise exceptions.InternalClientError(
+            'cannot register core codec for OID {}: it is greater '
+            'than MAXSUPPORTEDOID ({})'.format(oid, MAXSUPPORTEDOID))
+
+    cdef:
+        Codec codec
+        str name
+        str kind
+
+    name = BUILTIN_TYPE_OID_MAP[oid]
+    kind = 'array' if oid in ARRAY_TYPES else 'scalar'
+
+    codec = Codec(oid)
+    codec.init(name, 'pg_catalog', kind, CODEC_C, format, xformat,
+               encode, decode, None, None, None, None, None, None, None, 0)
+    cpython.Py_INCREF(codec)  # immortalize
+
+    if format == PG_FORMAT_BINARY:
+        (<CodecMap>codec_map).set_binary_codec_ptr(oid * xformat, <void*>codec)
+    elif format == PG_FORMAT_TEXT:
+        (<CodecMap>codec_map).set_text_codec_ptr(oid * xformat, <void*>codec)
+    else:
+        raise exceptions.InternalClientError(
+            'invalid data format: {}'.format(format))
+
+
+cdef register_extra_codec(str name,
+                          encode_func encode,
+                          decode_func decode,
+                          ServerDataFormat format):
+    cdef:
+        Codec codec
+        str kind
+
+    kind = 'scalar'
+
+    codec = Codec(INVALIDOID)
+    codec.init(name, None, kind, CODEC_C, format, PG_XFORMAT_OBJECT,
+               encode, decode, None, None, None, None, None, None, None, 0)
+    (<CodecMap>codec_map).extra_codecs[name, format] = codec
+
+
+cdef inline Codec get_extra_codec(str name, ServerDataFormat format):
+    return (<CodecMap>codec_map).extra_codecs.get((name, format))

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/codecs/pgproto.pyx

@@ -0,0 +1,484 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef init_bits_codecs():
+    register_core_codec(BITOID,
+                        <encode_func>pgproto.bits_encode,
+                        <decode_func>pgproto.bits_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(VARBITOID,
+                        <encode_func>pgproto.bits_encode,
+                        <decode_func>pgproto.bits_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_bytea_codecs():
+    register_core_codec(BYTEAOID,
+                        <encode_func>pgproto.bytea_encode,
+                        <decode_func>pgproto.bytea_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(CHAROID,
+                        <encode_func>pgproto.bytea_encode,
+                        <decode_func>pgproto.bytea_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_datetime_codecs():
+    register_core_codec(DATEOID,
+                        <encode_func>pgproto.date_encode,
+                        <decode_func>pgproto.date_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(DATEOID,
+                        <encode_func>pgproto.date_encode_tuple,
+                        <decode_func>pgproto.date_decode_tuple,
+                        PG_FORMAT_BINARY,
+                        PG_XFORMAT_TUPLE)
+
+    register_core_codec(TIMEOID,
+                        <encode_func>pgproto.time_encode,
+                        <decode_func>pgproto.time_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(TIMEOID,
+                        <encode_func>pgproto.time_encode_tuple,
+                        <decode_func>pgproto.time_decode_tuple,
+                        PG_FORMAT_BINARY,
+                        PG_XFORMAT_TUPLE)
+
+    register_core_codec(TIMETZOID,
+                        <encode_func>pgproto.timetz_encode,
+                        <decode_func>pgproto.timetz_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(TIMETZOID,
+                        <encode_func>pgproto.timetz_encode_tuple,
+                        <decode_func>pgproto.timetz_decode_tuple,
+                        PG_FORMAT_BINARY,
+                        PG_XFORMAT_TUPLE)
+
+    register_core_codec(TIMESTAMPOID,
+                        <encode_func>pgproto.timestamp_encode,
+                        <decode_func>pgproto.timestamp_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(TIMESTAMPOID,
+                        <encode_func>pgproto.timestamp_encode_tuple,
+                        <decode_func>pgproto.timestamp_decode_tuple,
+                        PG_FORMAT_BINARY,
+                        PG_XFORMAT_TUPLE)
+
+    register_core_codec(TIMESTAMPTZOID,
+                        <encode_func>pgproto.timestamptz_encode,
+                        <decode_func>pgproto.timestamptz_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(TIMESTAMPTZOID,
+                        <encode_func>pgproto.timestamp_encode_tuple,
+                        <decode_func>pgproto.timestamp_decode_tuple,
+                        PG_FORMAT_BINARY,
+                        PG_XFORMAT_TUPLE)
+
+    register_core_codec(INTERVALOID,
+                        <encode_func>pgproto.interval_encode,
+                        <decode_func>pgproto.interval_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(INTERVALOID,
+                        <encode_func>pgproto.interval_encode_tuple,
+                        <decode_func>pgproto.interval_decode_tuple,
+                        PG_FORMAT_BINARY,
+                        PG_XFORMAT_TUPLE)
+
+    # For obsolete abstime/reltime/tinterval, we do not bother to
+    # interpret the value, and simply return and pass it as text.
+    #
+    register_core_codec(ABSTIMEOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    register_core_codec(RELTIMEOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    register_core_codec(TINTERVALOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+
+cdef init_float_codecs():
+    register_core_codec(FLOAT4OID,
+                        <encode_func>pgproto.float4_encode,
+                        <decode_func>pgproto.float4_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(FLOAT8OID,
+                        <encode_func>pgproto.float8_encode,
+                        <decode_func>pgproto.float8_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_geometry_codecs():
+    register_core_codec(BOXOID,
+                        <encode_func>pgproto.box_encode,
+                        <decode_func>pgproto.box_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(LINEOID,
+                        <encode_func>pgproto.line_encode,
+                        <decode_func>pgproto.line_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(LSEGOID,
+                        <encode_func>pgproto.lseg_encode,
+                        <decode_func>pgproto.lseg_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(POINTOID,
+                        <encode_func>pgproto.point_encode,
+                        <decode_func>pgproto.point_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(PATHOID,
+                        <encode_func>pgproto.path_encode,
+                        <decode_func>pgproto.path_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(POLYGONOID,
+                        <encode_func>pgproto.poly_encode,
+                        <decode_func>pgproto.poly_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(CIRCLEOID,
+                        <encode_func>pgproto.circle_encode,
+                        <decode_func>pgproto.circle_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_hstore_codecs():
+    register_extra_codec('pg_contrib.hstore',
+                         <encode_func>pgproto.hstore_encode,
+                         <decode_func>pgproto.hstore_decode,
+                         PG_FORMAT_BINARY)
+
+
+cdef init_json_codecs():
+    register_core_codec(JSONOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_BINARY)
+    register_core_codec(JSONBOID,
+                        <encode_func>pgproto.jsonb_encode,
+                        <decode_func>pgproto.jsonb_decode,
+                        PG_FORMAT_BINARY)
+    register_core_codec(JSONPATHOID,
+                        <encode_func>pgproto.jsonpath_encode,
+                        <decode_func>pgproto.jsonpath_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_int_codecs():
+
+    register_core_codec(BOOLOID,
+                        <encode_func>pgproto.bool_encode,
+                        <decode_func>pgproto.bool_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(INT2OID,
+                        <encode_func>pgproto.int2_encode,
+                        <decode_func>pgproto.int2_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(INT4OID,
+                        <encode_func>pgproto.int4_encode,
+                        <decode_func>pgproto.int4_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(INT8OID,
+                        <encode_func>pgproto.int8_encode,
+                        <decode_func>pgproto.int8_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_pseudo_codecs():
+    # Void type is returned by SELECT void_returning_function()
+    register_core_codec(VOIDOID,
+                        <encode_func>pgproto.void_encode,
+                        <decode_func>pgproto.void_decode,
+                        PG_FORMAT_BINARY)
+
+    # Unknown type, always decoded as text
+    register_core_codec(UNKNOWNOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    # OID and friends
+    oid_types = [
+        OIDOID, XIDOID, CIDOID
+    ]
+
+    for oid_type in oid_types:
+        register_core_codec(oid_type,
+                            <encode_func>pgproto.uint4_encode,
+                            <decode_func>pgproto.uint4_decode,
+                            PG_FORMAT_BINARY)
+
+    # 64-bit OID types
+    oid8_types = [
+        XID8OID,
+    ]
+
+    for oid_type in oid8_types:
+        register_core_codec(oid_type,
+                            <encode_func>pgproto.uint8_encode,
+                            <decode_func>pgproto.uint8_decode,
+                            PG_FORMAT_BINARY)
+
+    # reg* types -- these are really system catalog OIDs, but
+    # allow the catalog object name as an input.  We could just
+    # decode these as OIDs, but handling them as text seems more
+    # useful.
+    #
+    reg_types = [
+        REGPROCOID, REGPROCEDUREOID, REGOPEROID, REGOPERATOROID,
+        REGCLASSOID, REGTYPEOID, REGCONFIGOID, REGDICTIONARYOID,
+        REGNAMESPACEOID, REGROLEOID, REFCURSOROID, REGCOLLATIONOID,
+    ]
+
+    for reg_type in reg_types:
+        register_core_codec(reg_type,
+                            <encode_func>pgproto.text_encode,
+                            <decode_func>pgproto.text_decode,
+                            PG_FORMAT_TEXT)
+
+    # cstring type is used by Postgres' I/O functions
+    register_core_codec(CSTRINGOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_BINARY)
+
+    # various system pseudotypes with no I/O
+    no_io_types = [
+        ANYOID, TRIGGEROID, EVENT_TRIGGEROID, LANGUAGE_HANDLEROID,
+        FDW_HANDLEROID, TSM_HANDLEROID, INTERNALOID, OPAQUEOID,
+        ANYELEMENTOID, ANYNONARRAYOID, ANYCOMPATIBLEOID,
+        ANYCOMPATIBLEARRAYOID, ANYCOMPATIBLENONARRAYOID,
+        ANYCOMPATIBLERANGEOID, ANYCOMPATIBLEMULTIRANGEOID,
+        ANYRANGEOID, ANYMULTIRANGEOID, ANYARRAYOID,
+        PG_DDL_COMMANDOID, INDEX_AM_HANDLEROID, TABLE_AM_HANDLEROID,
+    ]
+
+    register_core_codec(ANYENUMOID,
+                        NULL,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    for no_io_type in no_io_types:
+        register_core_codec(no_io_type,
+                            NULL,
+                            NULL,
+                            PG_FORMAT_BINARY)
+
+    # ACL specification string
+    register_core_codec(ACLITEMOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    # Postgres' serialized expression tree type
+    register_core_codec(PG_NODE_TREEOID,
+                        NULL,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    # pg_lsn type -- a pointer to a location in the XLOG.
+    register_core_codec(PG_LSNOID,
+                        <encode_func>pgproto.int8_encode,
+                        <decode_func>pgproto.int8_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(SMGROID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    # pg_dependencies and pg_ndistinct are special types
+    # used in pg_statistic_ext columns.
+    register_core_codec(PG_DEPENDENCIESOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    register_core_codec(PG_NDISTINCTOID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    # pg_mcv_list is a special type used in pg_statistic_ext_data
+    # system catalog
+    register_core_codec(PG_MCV_LISTOID,
+                        <encode_func>pgproto.bytea_encode,
+                        <decode_func>pgproto.bytea_decode,
+                        PG_FORMAT_BINARY)
+
+    # These two are internal to BRIN index support and are unlikely
+    # to be sent, but since I/O functions for these exist, add decoders
+    # nonetheless.
+    register_core_codec(PG_BRIN_BLOOM_SUMMARYOID,
+                        NULL,
+                        <decode_func>pgproto.bytea_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(PG_BRIN_MINMAX_MULTI_SUMMARYOID,
+                        NULL,
+                        <decode_func>pgproto.bytea_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_text_codecs():
+    textoids = [
+        NAMEOID,
+        BPCHAROID,
+        VARCHAROID,
+        TEXTOID,
+        XMLOID
+    ]
+
+    for oid in textoids:
+        register_core_codec(oid,
+                            <encode_func>pgproto.text_encode,
+                            <decode_func>pgproto.text_decode,
+                            PG_FORMAT_BINARY)
+
+        register_core_codec(oid,
+                            <encode_func>pgproto.text_encode,
+                            <decode_func>pgproto.text_decode,
+                            PG_FORMAT_TEXT)
+
+
+cdef init_tid_codecs():
+    register_core_codec(TIDOID,
+                        <encode_func>pgproto.tid_encode,
+                        <decode_func>pgproto.tid_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_txid_codecs():
+    register_core_codec(TXID_SNAPSHOTOID,
+                        <encode_func>pgproto.pg_snapshot_encode,
+                        <decode_func>pgproto.pg_snapshot_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(PG_SNAPSHOTOID,
+                        <encode_func>pgproto.pg_snapshot_encode,
+                        <decode_func>pgproto.pg_snapshot_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_tsearch_codecs():
+    ts_oids = [
+        TSQUERYOID,
+        TSVECTOROID,
+    ]
+
+    for oid in ts_oids:
+        register_core_codec(oid,
+                            <encode_func>pgproto.text_encode,
+                            <decode_func>pgproto.text_decode,
+                            PG_FORMAT_TEXT)
+
+    register_core_codec(GTSVECTOROID,
+                        NULL,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+
+cdef init_uuid_codecs():
+    register_core_codec(UUIDOID,
+                        <encode_func>pgproto.uuid_encode,
+                        <decode_func>pgproto.uuid_decode,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_numeric_codecs():
+    register_core_codec(NUMERICOID,
+                        <encode_func>pgproto.numeric_encode_text,
+                        <decode_func>pgproto.numeric_decode_text,
+                        PG_FORMAT_TEXT)
+
+    register_core_codec(NUMERICOID,
+                        <encode_func>pgproto.numeric_encode_binary,
+                        <decode_func>pgproto.numeric_decode_binary,
+                        PG_FORMAT_BINARY)
+
+
+cdef init_network_codecs():
+    register_core_codec(CIDROID,
+                        <encode_func>pgproto.cidr_encode,
+                        <decode_func>pgproto.cidr_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(INETOID,
+                        <encode_func>pgproto.inet_encode,
+                        <decode_func>pgproto.inet_decode,
+                        PG_FORMAT_BINARY)
+
+    register_core_codec(MACADDROID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+    register_core_codec(MACADDR8OID,
+                        <encode_func>pgproto.text_encode,
+                        <decode_func>pgproto.text_decode,
+                        PG_FORMAT_TEXT)
+
+
+cdef init_monetary_codecs():
+    moneyoids = [
+        MONEYOID,
+    ]
+
+    for oid in moneyoids:
+        register_core_codec(oid,
+                            <encode_func>pgproto.text_encode,
+                            <decode_func>pgproto.text_decode,
+                            PG_FORMAT_TEXT)
+
+
+cdef init_all_pgproto_codecs():
+    # Builtin types, in lexicographical order.
+    init_bits_codecs()
+    init_bytea_codecs()
+    init_datetime_codecs()
+    init_float_codecs()
+    init_geometry_codecs()
+    init_int_codecs()
+    init_json_codecs()
+    init_monetary_codecs()
+    init_network_codecs()
+    init_numeric_codecs()
+    init_text_codecs()
+    init_tid_codecs()
+    init_tsearch_codecs()
+    init_txid_codecs()
+    init_uuid_codecs()
+
+    # Various pseudotypes and system types
+    init_pseudo_codecs()
+
+    # contrib
+    init_hstore_codecs()
+
+
+init_all_pgproto_codecs()

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/codecs/range.pyx

@@ -0,0 +1,207 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from asyncpg import types as apg_types
+
+from collections.abc import Sequence as SequenceABC
+
+# defined in postgresql/src/include/utils/rangetypes.h
+DEF RANGE_EMPTY  = 0x01  # range is empty
+DEF RANGE_LB_INC = 0x02  # lower bound is inclusive
+DEF RANGE_UB_INC = 0x04  # upper bound is inclusive
+DEF RANGE_LB_INF = 0x08  # lower bound is -infinity
+DEF RANGE_UB_INF = 0x10  # upper bound is +infinity
+
+
+cdef enum _RangeArgumentType:
+    _RANGE_ARGUMENT_INVALID = 0
+    _RANGE_ARGUMENT_TUPLE = 1
+    _RANGE_ARGUMENT_RANGE = 2
+
+
+cdef inline bint _range_has_lbound(uint8_t flags):
+    return not (flags & (RANGE_EMPTY | RANGE_LB_INF))
+
+
+cdef inline bint _range_has_ubound(uint8_t flags):
+    return not (flags & (RANGE_EMPTY | RANGE_UB_INF))
+
+
+cdef inline _RangeArgumentType _range_type(object obj):
+    if cpython.PyTuple_Check(obj) or cpython.PyList_Check(obj):
+        return _RANGE_ARGUMENT_TUPLE
+    elif isinstance(obj, apg_types.Range):
+        return _RANGE_ARGUMENT_RANGE
+    else:
+        return _RANGE_ARGUMENT_INVALID
+
+
+cdef range_encode(ConnectionSettings settings, WriteBuffer buf,
+                  object obj, uint32_t elem_oid,
+                  encode_func_ex encoder, const void *encoder_arg):
+    cdef:
+        ssize_t obj_len
+        uint8_t flags = 0
+        object lower = None
+        object upper = None
+        WriteBuffer bounds_data = WriteBuffer.new()
+        _RangeArgumentType arg_type = _range_type(obj)
+
+    if arg_type == _RANGE_ARGUMENT_INVALID:
+        raise TypeError(
+            'list, tuple or Range object expected (got type {})'.format(
+                type(obj)))
+
+    elif arg_type == _RANGE_ARGUMENT_TUPLE:
+        obj_len = len(obj)
+        if obj_len == 2:
+            lower = obj[0]
+            upper = obj[1]
+
+            if lower is None:
+                flags |= RANGE_LB_INF
+
+            if upper is None:
+                flags |= RANGE_UB_INF
+
+            flags |= RANGE_LB_INC | RANGE_UB_INC
+
+        elif obj_len == 1:
+            lower = obj[0]
+            flags |= RANGE_LB_INC | RANGE_UB_INF
+
+        elif obj_len == 0:
+            flags |= RANGE_EMPTY
+
+        else:
+            raise ValueError(
+                'expected 0, 1 or 2 elements in range (got {})'.format(
+                    obj_len))
+
+    else:
+        if obj.isempty:
+            flags |= RANGE_EMPTY
+        else:
+            lower = obj.lower
+            upper = obj.upper
+
+            if obj.lower_inc:
+                flags |= RANGE_LB_INC
+            elif lower is None:
+                flags |= RANGE_LB_INF
+
+            if obj.upper_inc:
+                flags |= RANGE_UB_INC
+            elif upper is None:
+                flags |= RANGE_UB_INF
+
+    if _range_has_lbound(flags):
+        encoder(settings, bounds_data, lower, encoder_arg)
+
+    if _range_has_ubound(flags):
+        encoder(settings, bounds_data, upper, encoder_arg)
+
+    buf.write_int32(1 + bounds_data.len())
+    buf.write_byte(<int8_t>flags)
+    buf.write_buffer(bounds_data)
+
+
+cdef range_decode(ConnectionSettings settings, FRBuffer *buf,
+                  decode_func_ex decoder, const void *decoder_arg):
+    cdef:
+        uint8_t flags = <uint8_t>frb_read(buf, 1)[0]
+        int32_t bound_len
+        object lower = None
+        object upper = None
+        FRBuffer bound_buf
+
+    if _range_has_lbound(flags):
+        bound_len = hton.unpack_int32(frb_read(buf, 4))
+        if bound_len == -1:
+            lower = None
+        else:
+            frb_slice_from(&bound_buf, buf, bound_len)
+            lower = decoder(settings, &bound_buf, decoder_arg)
+
+    if _range_has_ubound(flags):
+        bound_len = hton.unpack_int32(frb_read(buf, 4))
+        if bound_len == -1:
+            upper = None
+        else:
+            frb_slice_from(&bound_buf, buf, bound_len)
+            upper = decoder(settings, &bound_buf, decoder_arg)
+
+    return apg_types.Range(lower=lower, upper=upper,
+                           lower_inc=(flags & RANGE_LB_INC) != 0,
+                           upper_inc=(flags & RANGE_UB_INC) != 0,
+                           empty=(flags & RANGE_EMPTY) != 0)
+
+
+cdef multirange_encode(ConnectionSettings settings, WriteBuffer buf,
+                       object obj, uint32_t elem_oid,
+                       encode_func_ex encoder, const void *encoder_arg):
+    cdef:
+        WriteBuffer elem_data
+        ssize_t elem_data_len
+        ssize_t elem_count
+
+    if not isinstance(obj, SequenceABC):
+        raise TypeError(
+            'expected a sequence (got type {!r})'.format(type(obj).__name__)
+        )
+
+    elem_data = WriteBuffer.new()
+
+    for elem in obj:
+        range_encode(settings, elem_data, elem, elem_oid, encoder, encoder_arg)
+
+    elem_count = len(obj)
+    if elem_count > INT32_MAX:
+        raise OverflowError(f'too many elements in multirange value')
+
+    elem_data_len = elem_data.len()
+    if elem_data_len > INT32_MAX - 4:
+        raise OverflowError(
+            f'size of encoded multirange datum exceeds the maximum allowed'
+            f' {INT32_MAX - 4} bytes')
+
+    # Datum length
+    buf.write_int32(4 + <int32_t>elem_data_len)
+    # Number of elements in multirange
+    buf.write_int32(<int32_t>elem_count)
+    buf.write_buffer(elem_data)
+
+
+cdef multirange_decode(ConnectionSettings settings, FRBuffer *buf,
+                       decode_func_ex decoder, const void *decoder_arg):
+    cdef:
+        int32_t nelems = hton.unpack_int32(frb_read(buf, 4))
+        FRBuffer elem_buf
+        int32_t elem_len
+        int i
+        list result
+
+    if nelems == 0:
+        return []
+
+    if nelems < 0:
+        raise exceptions.ProtocolError(
+            'unexpected multirange size value: {}'.format(nelems))
+
+    result = cpython.PyList_New(nelems)
+    for i in range(nelems):
+        elem_len = hton.unpack_int32(frb_read(buf, 4))
+        if elem_len == -1:
+            raise exceptions.ProtocolError(
+                'unexpected NULL element in multirange value')
+        else:
+            frb_slice_from(&elem_buf, buf, elem_len)
+        elem = range_decode(settings, &elem_buf, decoder, decoder_arg)
+        cpython.Py_INCREF(elem)
+        cpython.PyList_SET_ITEM(result, i, elem)
+
+    return result

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/codecs/record.pyx

@@ -0,0 +1,71 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from asyncpg import exceptions
+
+
+cdef inline record_encode_frame(ConnectionSettings settings, WriteBuffer buf,
+                                WriteBuffer elem_data, int32_t elem_count):
+    buf.write_int32(4 + elem_data.len())
+    # attribute count
+    buf.write_int32(elem_count)
+    # encoded attribute data
+    buf.write_buffer(elem_data)
+
+
+cdef anonymous_record_decode(ConnectionSettings settings, FRBuffer *buf):
+    cdef:
+        tuple result
+        ssize_t elem_count
+        ssize_t i
+        int32_t elem_len
+        uint32_t elem_typ
+        Codec elem_codec
+        FRBuffer elem_buf
+
+    elem_count = <ssize_t><uint32_t>hton.unpack_int32(frb_read(buf, 4))
+    result = cpython.PyTuple_New(elem_count)
+
+    for i in range(elem_count):
+        elem_typ = <uint32_t>hton.unpack_int32(frb_read(buf, 4))
+        elem_len = hton.unpack_int32(frb_read(buf, 4))
+
+        if elem_len == -1:
+            elem = None
+        else:
+            elem_codec = settings.get_data_codec(elem_typ)
+            if elem_codec is None or not elem_codec.has_decoder():
+                raise exceptions.InternalClientError(
+                    'no decoder for composite type element in '
+                    'position {} of type OID {}'.format(i, elem_typ))
+            elem = elem_codec.decode(settings,
+                                     frb_slice_from(&elem_buf, buf, elem_len))
+
+        cpython.Py_INCREF(elem)
+        cpython.PyTuple_SET_ITEM(result, i, elem)
+
+    return result
+
+
+cdef anonymous_record_encode(ConnectionSettings settings, WriteBuffer buf, obj):
+    raise exceptions.UnsupportedClientFeatureError(
+        'input of anonymous composite types is not supported',
+        hint=(
+            'Consider declaring an explicit composite type and '
+            'using it to cast the argument.'
+        ),
+        detail='PostgreSQL does not implement anonymous composite type input.'
+    )
+
+
+cdef init_record_codecs():
+    register_core_codec(RECORDOID,
+                        <encode_func>anonymous_record_encode,
+                        <decode_func>anonymous_record_decode,
+                        PG_FORMAT_BINARY)
+
+init_record_codecs()

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/codecs/textutils.pyx

@@ -0,0 +1,99 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef inline uint32_t _apg_tolower(uint32_t c):
+    if c >= <uint32_t><Py_UCS4>'A' and c <= <uint32_t><Py_UCS4>'Z':
+        return c + <uint32_t><Py_UCS4>'a' - <uint32_t><Py_UCS4>'A'
+    else:
+        return c
+
+
+cdef int apg_strcasecmp(const Py_UCS4 *s1, const Py_UCS4 *s2):
+    cdef:
+        uint32_t c1
+        uint32_t c2
+        int i = 0
+
+    while True:
+        c1 = s1[i]
+        c2 = s2[i]
+
+        if c1 != c2:
+            c1 = _apg_tolower(c1)
+            c2 = _apg_tolower(c2)
+            if c1 != c2:
+                return <int32_t>c1 - <int32_t>c2
+
+        if c1 == 0 or c2 == 0:
+            break
+
+        i += 1
+
+    return 0
+
+
+cdef int apg_strcasecmp_char(const char *s1, const char *s2):
+    cdef:
+        uint8_t c1
+        uint8_t c2
+        int i = 0
+
+    while True:
+        c1 = <uint8_t>s1[i]
+        c2 = <uint8_t>s2[i]
+
+        if c1 != c2:
+            c1 = <uint8_t>_apg_tolower(c1)
+            c2 = <uint8_t>_apg_tolower(c2)
+            if c1 != c2:
+                return <int8_t>c1 - <int8_t>c2
+
+        if c1 == 0 or c2 == 0:
+            break
+
+        i += 1
+
+    return 0
+
+
+cdef inline bint apg_ascii_isspace(Py_UCS4 ch):
+    return (
+        ch == ' ' or
+        ch == '\n' or
+        ch == '\r' or
+        ch == '\t' or
+        ch == '\v' or
+        ch == '\f'
+    )
+
+
+cdef Py_UCS4 *apg_parse_int32(Py_UCS4 *buf, int32_t *num):
+    cdef:
+        Py_UCS4 *p
+        int32_t n = 0
+        int32_t neg = 0
+
+    if buf[0] == '-':
+        neg = 1
+        buf += 1
+    elif buf[0] == '+':
+        buf += 1
+
+    p = buf
+    while <int>p[0] >= <int><Py_UCS4>'0' and <int>p[0] <= <int><Py_UCS4>'9':
+        n = 10 * n - (<int>p[0] - <int32_t><Py_UCS4>'0')
+        p += 1
+
+    if p == buf:
+        return NULL
+
+    if not neg:
+        n = -n
+
+    num[0] = n
+
+    return p

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/consts.pxi

@@ -0,0 +1,12 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+DEF _MAXINT32 = 2**31 - 1
+DEF _COPY_BUFFER_SIZE = 524288
+DEF _COPY_SIGNATURE = b"PGCOPY\n\377\r\n\0"
+DEF _EXECUTE_MANY_BUF_NUM = 4
+DEF _EXECUTE_MANY_BUF_SIZE = 32768

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/coreproto.pxd

@@ -0,0 +1,192 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+include "scram.pxd"
+
+
+cdef enum ConnectionStatus:
+    CONNECTION_OK = 1
+    CONNECTION_BAD = 2
+    CONNECTION_STARTED = 3           # Waiting for connection to be made.
+
+
+cdef enum ProtocolState:
+    PROTOCOL_IDLE = 0
+
+    PROTOCOL_FAILED = 1
+    PROTOCOL_ERROR_CONSUME = 2
+    PROTOCOL_CANCELLED = 3
+    PROTOCOL_TERMINATING = 4
+
+    PROTOCOL_AUTH = 10
+    PROTOCOL_PREPARE = 11
+    PROTOCOL_BIND_EXECUTE = 12
+    PROTOCOL_BIND_EXECUTE_MANY = 13
+    PROTOCOL_CLOSE_STMT_PORTAL = 14
+    PROTOCOL_SIMPLE_QUERY = 15
+    PROTOCOL_EXECUTE = 16
+    PROTOCOL_BIND = 17
+    PROTOCOL_COPY_OUT = 18
+    PROTOCOL_COPY_OUT_DATA = 19
+    PROTOCOL_COPY_OUT_DONE = 20
+    PROTOCOL_COPY_IN = 21
+    PROTOCOL_COPY_IN_DATA = 22
+
+
+cdef enum AuthenticationMessage:
+    AUTH_SUCCESSFUL = 0
+    AUTH_REQUIRED_KERBEROS = 2
+    AUTH_REQUIRED_PASSWORD = 3
+    AUTH_REQUIRED_PASSWORDMD5 = 5
+    AUTH_REQUIRED_SCMCRED = 6
+    AUTH_REQUIRED_GSS = 7
+    AUTH_REQUIRED_GSS_CONTINUE = 8
+    AUTH_REQUIRED_SSPI = 9
+    AUTH_REQUIRED_SASL = 10
+    AUTH_SASL_CONTINUE = 11
+    AUTH_SASL_FINAL = 12
+
+
+cdef enum ResultType:
+    RESULT_OK = 1
+    RESULT_FAILED = 2
+
+
+cdef enum TransactionStatus:
+    PQTRANS_IDLE = 0                 # connection idle
+    PQTRANS_ACTIVE = 1               # command in progress
+    PQTRANS_INTRANS = 2              # idle, within transaction block
+    PQTRANS_INERROR = 3              # idle, within failed transaction
+    PQTRANS_UNKNOWN = 4              # cannot determine status
+
+
+ctypedef object (*decode_row_method)(object, const char*, ssize_t)
+
+
+cdef class CoreProtocol:
+    cdef:
+        ReadBuffer buffer
+        bint _skip_discard
+        bint _discard_data
+
+        # executemany support data
+        object _execute_iter
+        str _execute_portal_name
+        str _execute_stmt_name
+
+        ConnectionStatus con_status
+        ProtocolState state
+        TransactionStatus xact_status
+
+        str encoding
+
+        object transport
+
+        object address
+        # Instance of _ConnectionParameters
+        object con_params
+        # Instance of SCRAMAuthentication
+        SCRAMAuthentication scram
+        # Instance of gssapi.SecurityContext or sspilib.SecurityContext
+        object gss_ctx
+
+        readonly int32_t backend_pid
+        readonly int32_t backend_secret
+
+        ## Result
+        ResultType result_type
+        object result
+        bytes result_param_desc
+        bytes result_row_desc
+        bytes result_status_msg
+
+        # True - completed, False - suspended
+        bint result_execute_completed
+
+    cpdef is_in_transaction(self)
+    cdef _process__auth(self, char mtype)
+    cdef _process__prepare(self, char mtype)
+    cdef _process__bind_execute(self, char mtype)
+    cdef _process__bind_execute_many(self, char mtype)
+    cdef _process__close_stmt_portal(self, char mtype)
+    cdef _process__simple_query(self, char mtype)
+    cdef _process__bind(self, char mtype)
+    cdef _process__copy_out(self, char mtype)
+    cdef _process__copy_out_data(self, char mtype)
+    cdef _process__copy_in(self, char mtype)
+    cdef _process__copy_in_data(self, char mtype)
+
+    cdef _parse_msg_authentication(self)
+    cdef _parse_msg_parameter_status(self)
+    cdef _parse_msg_notification(self)
+    cdef _parse_msg_backend_key_data(self)
+    cdef _parse_msg_ready_for_query(self)
+    cdef _parse_data_msgs(self)
+    cdef _parse_copy_data_msgs(self)
+    cdef _parse_msg_error_response(self, is_error)
+    cdef _parse_msg_command_complete(self)
+
+    cdef _write_copy_data_msg(self, object data)
+    cdef _write_copy_done_msg(self)
+    cdef _write_copy_fail_msg(self, str cause)
+
+    cdef _auth_password_message_cleartext(self)
+    cdef _auth_password_message_md5(self, bytes salt)
+    cdef _auth_password_message_sasl_initial(self, list sasl_auth_methods)
+    cdef _auth_password_message_sasl_continue(self, bytes server_response)
+    cdef _auth_gss_init_gssapi(self)
+    cdef _auth_gss_init_sspi(self, bint negotiate)
+    cdef _auth_gss_get_service(self)
+    cdef _auth_gss_step(self, bytes server_response)
+
+    cdef _write(self, buf)
+    cdef _writelines(self, list buffers)
+
+    cdef _read_server_messages(self)
+
+    cdef _push_result(self)
+    cdef _reset_result(self)
+    cdef _set_state(self, ProtocolState new_state)
+
+    cdef _ensure_connected(self)
+
+    cdef WriteBuffer _build_parse_message(self, str stmt_name, str query)
+    cdef WriteBuffer _build_bind_message(self, str portal_name,
+                                         str stmt_name,
+                                         WriteBuffer bind_data)
+    cdef WriteBuffer _build_empty_bind_data(self)
+    cdef WriteBuffer _build_execute_message(self, str portal_name,
+                                            int32_t limit)
+
+
+    cdef _connect(self)
+    cdef _prepare_and_describe(self, str stmt_name, str query)
+    cdef _send_parse_message(self, str stmt_name, str query)
+    cdef _send_bind_message(self, str portal_name, str stmt_name,
+                            WriteBuffer bind_data, int32_t limit)
+    cdef _bind_execute(self, str portal_name, str stmt_name,
+                       WriteBuffer bind_data, int32_t limit)
+    cdef bint _bind_execute_many(self, str portal_name, str stmt_name,
+                                 object bind_data, bint return_rows)
+    cdef bint _bind_execute_many_more(self, bint first=*)
+    cdef _bind_execute_many_fail(self, object error, bint first=*)
+    cdef _bind(self, str portal_name, str stmt_name,
+               WriteBuffer bind_data)
+    cdef _execute(self, str portal_name, int32_t limit)
+    cdef _close(self, str name, bint is_portal)
+    cdef _simple_query(self, str query)
+    cdef _copy_out(self, str copy_stmt)
+    cdef _copy_in(self, str copy_stmt)
+    cdef _terminate(self)
+
+    cdef _decode_row(self, const char* buf, ssize_t buf_len)
+
+    cdef _on_result(self)
+    cdef _on_notification(self, pid, channel, payload)
+    cdef _on_notice(self, parsed)
+    cdef _set_server_parameter(self, name, val)
+    cdef _on_connection_lost(self, exc)

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/cpythonx.pxd

@@ -0,0 +1,19 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef extern from "Python.h":
+    int PyByteArray_Check(object)
+
+    int PyMemoryView_Check(object)
+    Py_buffer *PyMemoryView_GET_BUFFER(object)
+    object PyMemoryView_GetContiguous(object, int buffertype, char order)
+
+    Py_UCS4* PyUnicode_AsUCS4Copy(object) except NULL
+    object PyUnicode_FromKindAndData(
+        int kind, const void *buffer, Py_ssize_t size)
+
+    int PyUnicode_4BYTE_KIND

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/encodings.pyx

@@ -0,0 +1,63 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+'''Map PostgreSQL encoding names to Python encoding names
+
+https://www.postgresql.org/docs/current/static/multibyte.html#CHARSET-TABLE
+'''
+
+ENCODINGS_MAP = {
+    'abc': 'cp1258',
+    'alt': 'cp866',
+    'euc_cn': 'euccn',
+    'euc_jp': 'eucjp',
+    'euc_kr': 'euckr',
+    'koi8r': 'koi8_r',
+    'koi8u': 'koi8_u',
+    'shift_jis_2004': 'euc_jis_2004',
+    'sjis': 'shift_jis',
+    'sql_ascii': 'ascii',
+    'vscii': 'cp1258',
+    'tcvn': 'cp1258',
+    'tcvn5712': 'cp1258',
+    'unicode': 'utf_8',
+    'win': 'cp1521',
+    'win1250': 'cp1250',
+    'win1251': 'cp1251',
+    'win1252': 'cp1252',
+    'win1253': 'cp1253',
+    'win1254': 'cp1254',
+    'win1255': 'cp1255',
+    'win1256': 'cp1256',
+    'win1257': 'cp1257',
+    'win1258': 'cp1258',
+    'win866': 'cp866',
+    'win874': 'cp874',
+    'win932': 'cp932',
+    'win936': 'cp936',
+    'win949': 'cp949',
+    'win950': 'cp950',
+    'windows1250': 'cp1250',
+    'windows1251': 'cp1251',
+    'windows1252': 'cp1252',
+    'windows1253': 'cp1253',
+    'windows1254': 'cp1254',
+    'windows1255': 'cp1255',
+    'windows1256': 'cp1256',
+    'windows1257': 'cp1257',
+    'windows1258': 'cp1258',
+    'windows866': 'cp866',
+    'windows874': 'cp874',
+    'windows932': 'cp932',
+    'windows936': 'cp936',
+    'windows949': 'cp949',
+    'windows950': 'cp950',
+}
+
+
+cdef get_python_encoding(pg_encoding):
+    return ENCODINGS_MAP.get(pg_encoding.lower(), pg_encoding.lower())

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/pgtypes.pxi

@@ -0,0 +1,266 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+# GENERATED FROM pg_catalog.pg_type
+# DO NOT MODIFY, use tools/generate_type_map.py to update
+
+DEF INVALIDOID = 0
+DEF MAXBUILTINOID = 9999
+DEF MAXSUPPORTEDOID = 5080
+
+DEF BOOLOID = 16
+DEF BYTEAOID = 17
+DEF CHAROID = 18
+DEF NAMEOID = 19
+DEF INT8OID = 20
+DEF INT2OID = 21
+DEF INT4OID = 23
+DEF REGPROCOID = 24
+DEF TEXTOID = 25
+DEF OIDOID = 26
+DEF TIDOID = 27
+DEF XIDOID = 28
+DEF CIDOID = 29
+DEF PG_DDL_COMMANDOID = 32
+DEF JSONOID = 114
+DEF XMLOID = 142
+DEF PG_NODE_TREEOID = 194
+DEF SMGROID = 210
+DEF TABLE_AM_HANDLEROID = 269
+DEF INDEX_AM_HANDLEROID = 325
+DEF POINTOID = 600
+DEF LSEGOID = 601
+DEF PATHOID = 602
+DEF BOXOID = 603
+DEF POLYGONOID = 604
+DEF LINEOID = 628
+DEF CIDROID = 650
+DEF FLOAT4OID = 700
+DEF FLOAT8OID = 701
+DEF ABSTIMEOID = 702
+DEF RELTIMEOID = 703
+DEF TINTERVALOID = 704
+DEF UNKNOWNOID = 705
+DEF CIRCLEOID = 718
+DEF MACADDR8OID = 774
+DEF MONEYOID = 790
+DEF MACADDROID = 829
+DEF INETOID = 869
+DEF _TEXTOID = 1009
+DEF _OIDOID = 1028
+DEF ACLITEMOID = 1033
+DEF BPCHAROID = 1042
+DEF VARCHAROID = 1043
+DEF DATEOID = 1082
+DEF TIMEOID = 1083
+DEF TIMESTAMPOID = 1114
+DEF TIMESTAMPTZOID = 1184
+DEF INTERVALOID = 1186
+DEF TIMETZOID = 1266
+DEF BITOID = 1560
+DEF VARBITOID = 1562
+DEF NUMERICOID = 1700
+DEF REFCURSOROID = 1790
+DEF REGPROCEDUREOID = 2202
+DEF REGOPEROID = 2203
+DEF REGOPERATOROID = 2204
+DEF REGCLASSOID = 2205
+DEF REGTYPEOID = 2206
+DEF RECORDOID = 2249
+DEF CSTRINGOID = 2275
+DEF ANYOID = 2276
+DEF ANYARRAYOID = 2277
+DEF VOIDOID = 2278
+DEF TRIGGEROID = 2279
+DEF LANGUAGE_HANDLEROID = 2280
+DEF INTERNALOID = 2281
+DEF OPAQUEOID = 2282
+DEF ANYELEMENTOID = 2283
+DEF ANYNONARRAYOID = 2776
+DEF UUIDOID = 2950
+DEF TXID_SNAPSHOTOID = 2970
+DEF FDW_HANDLEROID = 3115
+DEF PG_LSNOID = 3220
+DEF TSM_HANDLEROID = 3310
+DEF PG_NDISTINCTOID = 3361
+DEF PG_DEPENDENCIESOID = 3402
+DEF ANYENUMOID = 3500
+DEF TSVECTOROID = 3614
+DEF TSQUERYOID = 3615
+DEF GTSVECTOROID = 3642
+DEF REGCONFIGOID = 3734
+DEF REGDICTIONARYOID = 3769
+DEF JSONBOID = 3802
+DEF ANYRANGEOID = 3831
+DEF EVENT_TRIGGEROID = 3838
+DEF JSONPATHOID = 4072
+DEF REGNAMESPACEOID = 4089
+DEF REGROLEOID = 4096
+DEF REGCOLLATIONOID = 4191
+DEF ANYMULTIRANGEOID = 4537
+DEF ANYCOMPATIBLEMULTIRANGEOID = 4538
+DEF PG_BRIN_BLOOM_SUMMARYOID = 4600
+DEF PG_BRIN_MINMAX_MULTI_SUMMARYOID = 4601
+DEF PG_MCV_LISTOID = 5017
+DEF PG_SNAPSHOTOID = 5038
+DEF XID8OID = 5069
+DEF ANYCOMPATIBLEOID = 5077
+DEF ANYCOMPATIBLEARRAYOID = 5078
+DEF ANYCOMPATIBLENONARRAYOID = 5079
+DEF ANYCOMPATIBLERANGEOID = 5080
+
+ARRAY_TYPES = {_TEXTOID, _OIDOID}
+
+BUILTIN_TYPE_OID_MAP = {
+    ABSTIMEOID: 'abstime',
+    ACLITEMOID: 'aclitem',
+    ANYARRAYOID: 'anyarray',
+    ANYCOMPATIBLEARRAYOID: 'anycompatiblearray',
+    ANYCOMPATIBLEMULTIRANGEOID: 'anycompatiblemultirange',
+    ANYCOMPATIBLENONARRAYOID: 'anycompatiblenonarray',
+    ANYCOMPATIBLEOID: 'anycompatible',
+    ANYCOMPATIBLERANGEOID: 'anycompatiblerange',
+    ANYELEMENTOID: 'anyelement',
+    ANYENUMOID: 'anyenum',
+    ANYMULTIRANGEOID: 'anymultirange',
+    ANYNONARRAYOID: 'anynonarray',
+    ANYOID: 'any',
+    ANYRANGEOID: 'anyrange',
+    BITOID: 'bit',
+    BOOLOID: 'bool',
+    BOXOID: 'box',
+    BPCHAROID: 'bpchar',
+    BYTEAOID: 'bytea',
+    CHAROID: 'char',
+    CIDOID: 'cid',
+    CIDROID: 'cidr',
+    CIRCLEOID: 'circle',
+    CSTRINGOID: 'cstring',
+    DATEOID: 'date',
+    EVENT_TRIGGEROID: 'event_trigger',
+    FDW_HANDLEROID: 'fdw_handler',
+    FLOAT4OID: 'float4',
+    FLOAT8OID: 'float8',
+    GTSVECTOROID: 'gtsvector',
+    INDEX_AM_HANDLEROID: 'index_am_handler',
+    INETOID: 'inet',
+    INT2OID: 'int2',
+    INT4OID: 'int4',
+    INT8OID: 'int8',
+    INTERNALOID: 'internal',
+    INTERVALOID: 'interval',
+    JSONBOID: 'jsonb',
+    JSONOID: 'json',
+    JSONPATHOID: 'jsonpath',
+    LANGUAGE_HANDLEROID: 'language_handler',
+    LINEOID: 'line',
+    LSEGOID: 'lseg',
+    MACADDR8OID: 'macaddr8',
+    MACADDROID: 'macaddr',
+    MONEYOID: 'money',
+    NAMEOID: 'name',
+    NUMERICOID: 'numeric',
+    OIDOID: 'oid',
+    OPAQUEOID: 'opaque',
+    PATHOID: 'path',
+    PG_BRIN_BLOOM_SUMMARYOID: 'pg_brin_bloom_summary',
+    PG_BRIN_MINMAX_MULTI_SUMMARYOID: 'pg_brin_minmax_multi_summary',
+    PG_DDL_COMMANDOID: 'pg_ddl_command',
+    PG_DEPENDENCIESOID: 'pg_dependencies',
+    PG_LSNOID: 'pg_lsn',
+    PG_MCV_LISTOID: 'pg_mcv_list',
+    PG_NDISTINCTOID: 'pg_ndistinct',
+    PG_NODE_TREEOID: 'pg_node_tree',
+    PG_SNAPSHOTOID: 'pg_snapshot',
+    POINTOID: 'point',
+    POLYGONOID: 'polygon',
+    RECORDOID: 'record',
+    REFCURSOROID: 'refcursor',
+    REGCLASSOID: 'regclass',
+    REGCOLLATIONOID: 'regcollation',
+    REGCONFIGOID: 'regconfig',
+    REGDICTIONARYOID: 'regdictionary',
+    REGNAMESPACEOID: 'regnamespace',
+    REGOPERATOROID: 'regoperator',
+    REGOPEROID: 'regoper',
+    REGPROCEDUREOID: 'regprocedure',
+    REGPROCOID: 'regproc',
+    REGROLEOID: 'regrole',
+    REGTYPEOID: 'regtype',
+    RELTIMEOID: 'reltime',
+    SMGROID: 'smgr',
+    TABLE_AM_HANDLEROID: 'table_am_handler',
+    TEXTOID: 'text',
+    TIDOID: 'tid',
+    TIMEOID: 'time',
+    TIMESTAMPOID: 'timestamp',
+    TIMESTAMPTZOID: 'timestamptz',
+    TIMETZOID: 'timetz',
+    TINTERVALOID: 'tinterval',
+    TRIGGEROID: 'trigger',
+    TSM_HANDLEROID: 'tsm_handler',
+    TSQUERYOID: 'tsquery',
+    TSVECTOROID: 'tsvector',
+    TXID_SNAPSHOTOID: 'txid_snapshot',
+    UNKNOWNOID: 'unknown',
+    UUIDOID: 'uuid',
+    VARBITOID: 'varbit',
+    VARCHAROID: 'varchar',
+    VOIDOID: 'void',
+    XID8OID: 'xid8',
+    XIDOID: 'xid',
+    XMLOID: 'xml',
+    _OIDOID: 'oid[]',
+    _TEXTOID: 'text[]'
+}
+
+BUILTIN_TYPE_NAME_MAP = {v: k for k, v in BUILTIN_TYPE_OID_MAP.items()}
+
+BUILTIN_TYPE_NAME_MAP['smallint'] = \
+    BUILTIN_TYPE_NAME_MAP['int2']
+
+BUILTIN_TYPE_NAME_MAP['int'] = \
+    BUILTIN_TYPE_NAME_MAP['int4']
+
+BUILTIN_TYPE_NAME_MAP['integer'] = \
+    BUILTIN_TYPE_NAME_MAP['int4']
+
+BUILTIN_TYPE_NAME_MAP['bigint'] = \
+    BUILTIN_TYPE_NAME_MAP['int8']
+
+BUILTIN_TYPE_NAME_MAP['decimal'] = \
+    BUILTIN_TYPE_NAME_MAP['numeric']
+
+BUILTIN_TYPE_NAME_MAP['real'] = \
+    BUILTIN_TYPE_NAME_MAP['float4']
+
+BUILTIN_TYPE_NAME_MAP['double precision'] = \
+    BUILTIN_TYPE_NAME_MAP['float8']
+
+BUILTIN_TYPE_NAME_MAP['timestamp with timezone'] = \
+    BUILTIN_TYPE_NAME_MAP['timestamptz']
+
+BUILTIN_TYPE_NAME_MAP['timestamp without timezone'] = \
+    BUILTIN_TYPE_NAME_MAP['timestamp']
+
+BUILTIN_TYPE_NAME_MAP['time with timezone'] = \
+    BUILTIN_TYPE_NAME_MAP['timetz']
+
+BUILTIN_TYPE_NAME_MAP['time without timezone'] = \
+    BUILTIN_TYPE_NAME_MAP['time']
+
+BUILTIN_TYPE_NAME_MAP['char'] = \
+    BUILTIN_TYPE_NAME_MAP['bpchar']
+
+BUILTIN_TYPE_NAME_MAP['character'] = \
+    BUILTIN_TYPE_NAME_MAP['bpchar']
+
+BUILTIN_TYPE_NAME_MAP['character varying'] = \
+    BUILTIN_TYPE_NAME_MAP['varchar']
+
+BUILTIN_TYPE_NAME_MAP['bit varying'] = \
+    BUILTIN_TYPE_NAME_MAP['varbit']

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/prepared_stmt.pxd

@@ -0,0 +1,39 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cdef class PreparedStatementState:
+    cdef:
+        readonly str name
+        readonly str query
+        readonly bint closed
+        readonly bint prepared
+        readonly int refs
+        readonly type record_class
+        readonly bint ignore_custom_codec
+
+
+        list         row_desc
+        list         parameters_desc
+
+        ConnectionSettings settings
+
+        int16_t      args_num
+        bint         have_text_args
+        tuple        args_codecs
+
+        int16_t      cols_num
+        object       cols_desc
+        bint         have_text_cols
+        tuple        rows_codecs
+
+    cdef _encode_bind_msg(self, args, int seqno = ?)
+    cpdef _init_codecs(self)
+    cdef _ensure_rows_decoder(self)
+    cdef _ensure_args_encoder(self)
+    cdef _set_row_desc(self, object desc)
+    cdef _set_args_desc(self, object desc)
+    cdef _decode_row(self, const char* cbuf, ssize_t buf_len)

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/prepared_stmt.pyx

@@ -0,0 +1,395 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from asyncpg import exceptions
+
+
+@cython.final
+cdef class PreparedStatementState:
+
+    def __cinit__(
+        self,
+        str name,
+        str query,
+        BaseProtocol protocol,
+        type record_class,
+        bint ignore_custom_codec
+    ):
+        self.name = name
+        self.query = query
+        self.settings = protocol.settings
+        self.row_desc = self.parameters_desc = None
+        self.args_codecs = self.rows_codecs = None
+        self.args_num = self.cols_num = 0
+        self.cols_desc = None
+        self.closed = False
+        self.prepared = True
+        self.refs = 0
+        self.record_class = record_class
+        self.ignore_custom_codec = ignore_custom_codec
+
+    def _get_parameters(self):
+        cdef Codec codec
+
+        result = []
+        for oid in self.parameters_desc:
+            codec = self.settings.get_data_codec(oid)
+            if codec is None:
+                raise exceptions.InternalClientError(
+                    'missing codec information for OID {}'.format(oid))
+            result.append(apg_types.Type(
+                oid, codec.name, codec.kind, codec.schema))
+
+        return tuple(result)
+
+    def _get_attributes(self):
+        cdef Codec codec
+
+        if not self.row_desc:
+            return ()
+
+        result = []
+        for d in self.row_desc:
+            name = d[0]
+            oid = d[3]
+
+            codec = self.settings.get_data_codec(oid)
+            if codec is None:
+                raise exceptions.InternalClientError(
+                    'missing codec information for OID {}'.format(oid))
+
+            name = name.decode(self.settings._encoding)
+
+            result.append(
+                apg_types.Attribute(name,
+                    apg_types.Type(oid, codec.name, codec.kind, codec.schema)))
+
+        return tuple(result)
+
+    def _init_types(self):
+        cdef:
+            Codec codec
+            set missing = set()
+
+        if self.parameters_desc:
+            for p_oid in self.parameters_desc:
+                codec = self.settings.get_data_codec(<uint32_t>p_oid)
+                if codec is None or not codec.has_encoder():
+                    missing.add(p_oid)
+
+        if self.row_desc:
+            for rdesc in self.row_desc:
+                codec = self.settings.get_data_codec(<uint32_t>(rdesc[3]))
+                if codec is None or not codec.has_decoder():
+                    missing.add(rdesc[3])
+
+        return missing
+
+    cpdef _init_codecs(self):
+        self._ensure_args_encoder()
+        self._ensure_rows_decoder()
+
+    def attach(self):
+        self.refs += 1
+
+    def detach(self):
+        self.refs -= 1
+
+    def mark_closed(self):
+        self.closed = True
+
+    def mark_unprepared(self):
+        if self.name:
+            raise exceptions.InternalClientError(
+                "named prepared statements cannot be marked unprepared")
+        self.prepared = False
+
+    cdef _encode_bind_msg(self, args, int seqno = -1):
+        cdef:
+            int idx
+            WriteBuffer writer
+            Codec codec
+
+        if not cpython.PySequence_Check(args):
+            if seqno >= 0:
+                raise exceptions.DataError(
+                    f'invalid input in executemany() argument sequence '
+                    f'element #{seqno}: expected a sequence, got '
+                    f'{type(args).__name__}'
+                )
+            else:
+                # Non executemany() callers do not pass user input directly,
+                # so bad input is a bug.
+                raise exceptions.InternalClientError(
+                    f'Bind: expected a sequence, got {type(args).__name__}')
+
+        if len(args) > 32767:
+            raise exceptions.InterfaceError(
+                'the number of query arguments cannot exceed 32767')
+
+        writer = WriteBuffer.new()
+
+        num_args_passed = len(args)
+        if self.args_num != num_args_passed:
+            hint = 'Check the query against the passed list of arguments.'
+
+            if self.args_num == 0:
+                # If the server was expecting zero arguments, it is likely
+                # that the user tried to parametrize a statement that does
+                # not support parameters.
+                hint += (r'  Note that parameters are supported only in'
+                         r' SELECT, INSERT, UPDATE, DELETE, MERGE and VALUES'
+                         r' statements, and will *not* work in statements '
+                         r' like CREATE VIEW or DECLARE CURSOR.')
+
+            raise exceptions.InterfaceError(
+                'the server expects {x} argument{s} for this query, '
+                '{y} {w} passed'.format(
+                    x=self.args_num, s='s' if self.args_num != 1 else '',
+                    y=num_args_passed,
+                    w='was' if num_args_passed == 1 else 'were'),
+                hint=hint)
+
+        if self.have_text_args:
+            writer.write_int16(self.args_num)
+            for idx in range(self.args_num):
+                codec = <Codec>(self.args_codecs[idx])
+                writer.write_int16(<int16_t>codec.format)
+        else:
+            # All arguments are in binary format
+            writer.write_int32(0x00010001)
+
+        writer.write_int16(self.args_num)
+
+        for idx in range(self.args_num):
+            arg = args[idx]
+            if arg is None:
+                writer.write_int32(-1)
+            else:
+                codec = <Codec>(self.args_codecs[idx])
+                try:
+                    codec.encode(self.settings, writer, arg)
+                except (AssertionError, exceptions.InternalClientError):
+                    # These are internal errors and should raise as-is.
+                    raise
+                except exceptions.InterfaceError as e:
+                    # This is already a descriptive error, but annotate
+                    # with argument name for clarity.
+                    pos = f'${idx + 1}'
+                    if seqno >= 0:
+                        pos = (
+                            f'{pos} in element #{seqno} of'
+                            f' executemany() sequence'
+                        )
+                    raise e.with_msg(
+                        f'query argument {pos}: {e.args[0]}'
+                    ) from None
+                except Exception as e:
+                    # Everything else is assumed to be an encoding error
+                    # due to invalid input.
+                    pos = f'${idx + 1}'
+                    if seqno >= 0:
+                        pos = (
+                            f'{pos} in element #{seqno} of'
+                            f' executemany() sequence'
+                        )
+                    value_repr = repr(arg)
+                    if len(value_repr) > 40:
+                        value_repr = value_repr[:40] + '...'
+
+                    raise exceptions.DataError(
+                        f'invalid input for query argument'
+                        f' {pos}: {value_repr} ({e})'
+                    ) from e
+
+        if self.have_text_cols:
+            writer.write_int16(self.cols_num)
+            for idx in range(self.cols_num):
+                codec = <Codec>(self.rows_codecs[idx])
+                writer.write_int16(<int16_t>codec.format)
+        else:
+            # All columns are in binary format
+            writer.write_int32(0x00010001)
+
+        return writer
+
+    cdef _ensure_rows_decoder(self):
+        cdef:
+            list cols_names
+            object cols_mapping
+            tuple row
+            uint32_t oid
+            Codec codec
+            list codecs
+
+        if self.cols_desc is not None:
+            return
+
+        if self.cols_num == 0:
+            self.cols_desc = RecordDescriptor({}, ())
+            return
+
+        cols_mapping = collections.OrderedDict()
+        cols_names = []
+        codecs = []
+        for i from 0 <= i < self.cols_num:
+            row = self.row_desc[i]
+            col_name = row[0].decode(self.settings._encoding)
+            cols_mapping[col_name] = i
+            cols_names.append(col_name)
+            oid = row[3]
+            codec = self.settings.get_data_codec(
+                oid, ignore_custom_codec=self.ignore_custom_codec)
+            if codec is None or not codec.has_decoder():
+                raise exceptions.InternalClientError(
+                    'no decoder for OID {}'.format(oid))
+            if not codec.is_binary():
+                self.have_text_cols = True
+
+            codecs.append(codec)
+
+        self.cols_desc = RecordDescriptor(
+            cols_mapping, tuple(cols_names))
+
+        self.rows_codecs = tuple(codecs)
+
+    cdef _ensure_args_encoder(self):
+        cdef:
+            uint32_t p_oid
+            Codec codec
+            list codecs = []
+
+        if self.args_num == 0 or self.args_codecs is not None:
+            return
+
+        for i from 0 <= i < self.args_num:
+            p_oid = self.parameters_desc[i]
+            codec = self.settings.get_data_codec(
+                p_oid, ignore_custom_codec=self.ignore_custom_codec)
+            if codec is None or not codec.has_encoder():
+                raise exceptions.InternalClientError(
+                    'no encoder for OID {}'.format(p_oid))
+            if codec.type not in {}:
+                self.have_text_args = True
+
+            codecs.append(codec)
+
+        self.args_codecs = tuple(codecs)
+
+    cdef _set_row_desc(self, object desc):
+        self.row_desc = _decode_row_desc(desc)
+        self.cols_num = <int16_t>(len(self.row_desc))
+
+    cdef _set_args_desc(self, object desc):
+        self.parameters_desc = _decode_parameters_desc(desc)
+        self.args_num = <int16_t>(len(self.parameters_desc))
+
+    cdef _decode_row(self, const char* cbuf, ssize_t buf_len):
+        cdef:
+            Codec codec
+            int16_t fnum
+            int32_t flen
+            object dec_row
+            tuple rows_codecs = self.rows_codecs
+            ConnectionSettings settings = self.settings
+            int32_t i
+            FRBuffer rbuf
+            ssize_t bl
+
+        frb_init(&rbuf, cbuf, buf_len)
+
+        fnum = hton.unpack_int16(frb_read(&rbuf, 2))
+
+        if fnum != self.cols_num:
+            raise exceptions.ProtocolError(
+                'the number of columns in the result row ({}) is '
+                'different from what was described ({})'.format(
+                    fnum, self.cols_num))
+
+        dec_row = self.cols_desc.make_record(self.record_class, fnum)
+        for i in range(fnum):
+            flen = hton.unpack_int32(frb_read(&rbuf, 4))
+
+            if flen == -1:
+                val = None
+            else:
+                # Clamp buffer size to that of the reported field length
+                # to make sure that codecs can rely on read_all() working
+                # properly.
+                bl = frb_get_len(&rbuf)
+                if flen > bl:
+                    frb_check(&rbuf, flen)
+                frb_set_len(&rbuf, flen)
+                codec = <Codec>cpython.PyTuple_GET_ITEM(rows_codecs, i)
+                val = codec.decode(settings, &rbuf)
+                if frb_get_len(&rbuf) != 0:
+                    raise BufferError(
+                        'unexpected trailing {} bytes in buffer'.format(
+                            frb_get_len(&rbuf)))
+                frb_set_len(&rbuf, bl - flen)
+
+            cpython.Py_INCREF(val)
+            recordcapi.ApgRecord_SET_ITEM(dec_row, i, val)
+
+        if frb_get_len(&rbuf) != 0:
+            raise BufferError('unexpected trailing {} bytes in buffer'.format(
+                frb_get_len(&rbuf)))
+
+        return dec_row
+
+
+cdef _decode_parameters_desc(object desc):
+    cdef:
+        ReadBuffer reader
+        int16_t nparams
+        uint32_t p_oid
+        list result = []
+
+    reader = ReadBuffer.new_message_parser(desc)
+    nparams = reader.read_int16()
+
+    for i from 0 <= i < nparams:
+        p_oid = <uint32_t>reader.read_int32()
+        result.append(p_oid)
+
+    return result
+
+
+cdef _decode_row_desc(object desc):
+    cdef:
+        ReadBuffer reader
+
+        int16_t nfields
+
+        bytes f_name
+        uint32_t f_table_oid
+        int16_t f_column_num
+        uint32_t f_dt_oid
+        int16_t f_dt_size
+        int32_t f_dt_mod
+        int16_t f_format
+
+        list result
+
+    reader = ReadBuffer.new_message_parser(desc)
+    nfields = reader.read_int16()
+    result = []
+
+    for i from 0 <= i < nfields:
+        f_name = reader.read_null_str()
+        f_table_oid = <uint32_t>reader.read_int32()
+        f_column_num = reader.read_int16()
+        f_dt_oid = <uint32_t>reader.read_int32()
+        f_dt_size = reader.read_int16()
+        f_dt_mod = reader.read_int32()
+        f_format = reader.read_int16()
+
+        result.append(
+            (f_name, f_table_oid, f_column_num, f_dt_oid,
+             f_dt_size, f_dt_mod, f_format))
+
+    return result

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/protocol.pxd

@@ -0,0 +1,77 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+from libc.stdint cimport int16_t, int32_t, uint16_t, \
+                         uint32_t, int64_t, uint64_t
+
+from asyncpg.pgproto.debug cimport PG_DEBUG
+
+from asyncpg.pgproto.pgproto cimport (
+    WriteBuffer,
+    ReadBuffer,
+    FRBuffer,
+)
+
+from asyncpg.pgproto cimport pgproto
+
+include "consts.pxi"
+include "pgtypes.pxi"
+
+include "codecs/base.pxd"
+include "settings.pxd"
+include "coreproto.pxd"
+include "prepared_stmt.pxd"
+
+
+cdef class BaseProtocol(CoreProtocol):
+
+    cdef:
+        object loop
+        ConnectionSettings settings
+        object cancel_sent_waiter
+        object cancel_waiter
+        object waiter
+        bint return_extra
+        object create_future
+        object timeout_handle
+        object conref
+        type record_class
+        bint is_reading
+
+        str last_query
+
+        bint writing_paused
+        bint closing
+
+        readonly uint64_t queries_count
+
+        bint _is_ssl
+
+        PreparedStatementState statement
+
+    cdef get_connection(self)
+
+    cdef _get_timeout_impl(self, timeout)
+    cdef _check_state(self)
+    cdef _new_waiter(self, timeout)
+    cdef _coreproto_error(self)
+
+    cdef _on_result__connect(self, object waiter)
+    cdef _on_result__prepare(self, object waiter)
+    cdef _on_result__bind_and_exec(self, object waiter)
+    cdef _on_result__close_stmt_or_portal(self, object waiter)
+    cdef _on_result__simple_query(self, object waiter)
+    cdef _on_result__bind(self, object waiter)
+    cdef _on_result__copy_out(self, object waiter)
+    cdef _on_result__copy_in(self, object waiter)
+
+    cdef _handle_waiter_on_connection_lost(self, cause)
+
+    cdef _dispatch_result(self)
+
+    cdef inline resume_reading(self)
+    cdef inline pause_reading(self)

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/protocol.pyi

@@ -0,0 +1,282 @@
+import asyncio
+import asyncio.protocols
+import hmac
+from codecs import CodecInfo
+from collections.abc import Callable, Iterable, Sequence
+from hashlib import md5, sha256
+from typing import (
+    Any,
+    ClassVar,
+    Final,
+    Generic,
+    Literal,
+    NewType,
+    TypeVar,
+    final,
+    overload,
+)
+from typing_extensions import TypeAlias
+
+import asyncpg.pgproto.pgproto
+
+from ..connect_utils import _ConnectionParameters
+from ..pgproto.pgproto import WriteBuffer
+from ..types import Attribute, Type
+from .record import Record
+
+_Record = TypeVar('_Record', bound=Record)
+_OtherRecord = TypeVar('_OtherRecord', bound=Record)
+_PreparedStatementState = TypeVar(
+    '_PreparedStatementState', bound=PreparedStatementState[Any]
+)
+
+_NoTimeoutType = NewType('_NoTimeoutType', object)
+_TimeoutType: TypeAlias = float | None | _NoTimeoutType
+
+BUILTIN_TYPE_NAME_MAP: Final[dict[str, int]]
+BUILTIN_TYPE_OID_MAP: Final[dict[int, str]]
+NO_TIMEOUT: Final[_NoTimeoutType]
+
+hashlib_md5 = md5
+
+@final
+class ConnectionSettings(asyncpg.pgproto.pgproto.CodecContext):
+    __pyx_vtable__: Any
+    def __init__(self, conn_key: object) -> None: ...
+    def add_python_codec(
+        self,
+        typeoid: int,
+        typename: str,
+        typeschema: str,
+        typeinfos: Iterable[object],
+        typekind: str,
+        encoder: Callable[[Any], Any],
+        decoder: Callable[[Any], Any],
+        format: object,
+    ) -> Any: ...
+    def clear_type_cache(self) -> None: ...
+    def get_data_codec(
+        self, oid: int, format: object = ..., ignore_custom_codec: bool = ...
+    ) -> Any: ...
+    def get_text_codec(self) -> CodecInfo: ...
+    def register_data_types(self, types: Iterable[object]) -> None: ...
+    def remove_python_codec(
+        self, typeoid: int, typename: str, typeschema: str
+    ) -> None: ...
+    def set_builtin_type_codec(
+        self,
+        typeoid: int,
+        typename: str,
+        typeschema: str,
+        typekind: str,
+        alias_to: str,
+        format: object = ...,
+    ) -> Any: ...
+    def __getattr__(self, name: str) -> Any: ...
+    def __reduce__(self) -> Any: ...
+
+@final
+class PreparedStatementState(Generic[_Record]):
+    closed: bool
+    prepared: bool
+    name: str
+    query: str
+    refs: int
+    record_class: type[_Record]
+    ignore_custom_codec: bool
+    __pyx_vtable__: Any
+    def __init__(
+        self,
+        name: str,
+        query: str,
+        protocol: BaseProtocol[Any],
+        record_class: type[_Record],
+        ignore_custom_codec: bool,
+    ) -> None: ...
+    def _get_parameters(self) -> tuple[Type, ...]: ...
+    def _get_attributes(self) -> tuple[Attribute, ...]: ...
+    def _init_types(self) -> set[int]: ...
+    def _init_codecs(self) -> None: ...
+    def attach(self) -> None: ...
+    def detach(self) -> None: ...
+    def mark_closed(self) -> None: ...
+    def mark_unprepared(self) -> None: ...
+    def __reduce__(self) -> Any: ...
+
+class CoreProtocol:
+    backend_pid: Any
+    backend_secret: Any
+    __pyx_vtable__: Any
+    def __init__(self, addr: object, con_params: _ConnectionParameters) -> None: ...
+    def is_in_transaction(self) -> bool: ...
+    def __reduce__(self) -> Any: ...
+
+class BaseProtocol(CoreProtocol, Generic[_Record]):
+    queries_count: Any
+    is_ssl: bool
+    __pyx_vtable__: Any
+    def __init__(
+        self,
+        addr: object,
+        connected_fut: object,
+        con_params: _ConnectionParameters,
+        record_class: type[_Record],
+        loop: object,
+    ) -> None: ...
+    def set_connection(self, connection: object) -> None: ...
+    def get_server_pid(self, *args: object, **kwargs: object) -> int: ...
+    def get_settings(self, *args: object, **kwargs: object) -> ConnectionSettings: ...
+    def get_record_class(self) -> type[_Record]: ...
+    def abort(self) -> None: ...
+    async def bind(
+        self,
+        state: PreparedStatementState[_OtherRecord],
+        args: Sequence[object],
+        portal_name: str,
+        timeout: _TimeoutType,
+    ) -> Any: ...
+    @overload
+    async def bind_execute(
+        self,
+        state: PreparedStatementState[_OtherRecord],
+        args: Sequence[object],
+        portal_name: str,
+        limit: int,
+        return_extra: Literal[False],
+        timeout: _TimeoutType,
+    ) -> list[_OtherRecord]: ...
+    @overload
+    async def bind_execute(
+        self,
+        state: PreparedStatementState[_OtherRecord],
+        args: Sequence[object],
+        portal_name: str,
+        limit: int,
+        return_extra: Literal[True],
+        timeout: _TimeoutType,
+    ) -> tuple[list[_OtherRecord], bytes, bool]: ...
+    @overload
+    async def bind_execute(
+        self,
+        state: PreparedStatementState[_OtherRecord],
+        args: Sequence[object],
+        portal_name: str,
+        limit: int,
+        return_extra: bool,
+        timeout: _TimeoutType,
+    ) -> list[_OtherRecord] | tuple[list[_OtherRecord], bytes, bool]: ...
+    async def bind_execute_many(
+        self,
+        state: PreparedStatementState[_OtherRecord],
+        args: Iterable[Sequence[object]],
+        portal_name: str,
+        timeout: _TimeoutType,
+    ) -> None: ...
+    async def close(self, timeout: _TimeoutType) -> None: ...
+    def _get_timeout(self, timeout: _TimeoutType) -> float | None: ...
+    def _is_cancelling(self) -> bool: ...
+    async def _wait_for_cancellation(self) -> None: ...
+    async def close_statement(
+        self, state: PreparedStatementState[_OtherRecord], timeout: _TimeoutType
+    ) -> Any: ...
+    async def copy_in(self, *args: object, **kwargs: object) -> str: ...
+    async def copy_out(self, *args: object, **kwargs: object) -> str: ...
+    async def execute(self, *args: object, **kwargs: object) -> Any: ...
+    def is_closed(self, *args: object, **kwargs: object) -> Any: ...
+    def is_connected(self, *args: object, **kwargs: object) -> Any: ...
+    def data_received(self, data: object) -> None: ...
+    def connection_made(self, transport: object) -> None: ...
+    def connection_lost(self, exc: Exception | None) -> None: ...
+    def pause_writing(self, *args: object, **kwargs: object) -> Any: ...
+    @overload
+    async def prepare(
+        self,
+        stmt_name: str,
+        query: str,
+        timeout: float | None = ...,
+        *,
+        state: _PreparedStatementState,
+        ignore_custom_codec: bool = ...,
+        record_class: None,
+    ) -> _PreparedStatementState: ...
+    @overload
+    async def prepare(
+        self,
+        stmt_name: str,
+        query: str,
+        timeout: float | None = ...,
+        *,
+        state: None = ...,
+        ignore_custom_codec: bool = ...,
+        record_class: type[_OtherRecord],
+    ) -> PreparedStatementState[_OtherRecord]: ...
+    async def close_portal(self, portal_name: str, timeout: _TimeoutType) -> None: ...
+    async def query(self, *args: object, **kwargs: object) -> str: ...
+    def resume_writing(self, *args: object, **kwargs: object) -> Any: ...
+    def __reduce__(self) -> Any: ...
+
+@final
+class Codec:
+    __pyx_vtable__: Any
+    def __reduce__(self) -> Any: ...
+
+class DataCodecConfig:
+    __pyx_vtable__: Any
+    def __init__(self) -> None: ...
+    def add_python_codec(
+        self,
+        typeoid: int,
+        typename: str,
+        typeschema: str,
+        typekind: str,
+        typeinfos: Iterable[object],
+        encoder: Callable[[ConnectionSettings, WriteBuffer, object], object],
+        decoder: Callable[..., object],
+        format: object,
+        xformat: object,
+    ) -> Any: ...
+    def add_types(self, types: Iterable[object]) -> Any: ...
+    def clear_type_cache(self) -> None: ...
+    def declare_fallback_codec(self, oid: int, name: str, schema: str) -> Codec: ...
+    def remove_python_codec(
+        self, typeoid: int, typename: str, typeschema: str
+    ) -> Any: ...
+    def set_builtin_type_codec(
+        self,
+        typeoid: int,
+        typename: str,
+        typeschema: str,
+        typekind: str,
+        alias_to: str,
+        format: object = ...,
+    ) -> Any: ...
+    def __reduce__(self) -> Any: ...
+
+class Protocol(BaseProtocol[_Record], asyncio.protocols.Protocol): ...
+
+class Timer:
+    def __init__(self, budget: float | None) -> None: ...
+    def __enter__(self) -> None: ...
+    def __exit__(self, et: object, e: object, tb: object) -> None: ...
+    def get_remaining_budget(self) -> float: ...
+    def has_budget_greater_than(self, amount: float) -> bool: ...
+
+@final
+class SCRAMAuthentication:
+    AUTHENTICATION_METHODS: ClassVar[list[str]]
+    DEFAULT_CLIENT_NONCE_BYTES: ClassVar[int]
+    DIGEST = sha256
+    REQUIREMENTS_CLIENT_FINAL_MESSAGE: ClassVar[list[str]]
+    REQUIREMENTS_CLIENT_PROOF: ClassVar[list[str]]
+    SASLPREP_PROHIBITED: ClassVar[tuple[Callable[[str], bool], ...]]
+    authentication_method: bytes
+    authorization_message: bytes | None
+    client_channel_binding: bytes
+    client_first_message_bare: bytes | None
+    client_nonce: bytes | None
+    client_proof: bytes | None
+    password_salt: bytes | None
+    password_iterations: int
+    server_first_message: bytes | None
+    server_key: hmac.HMAC | None
+    server_nonce: bytes | None

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/record.pyi

@@ -0,0 +1,29 @@
+from typing import (
+    Any,
+    TypeVar,
+    overload,
+)
+
+from collections.abc import Iterator
+
+
+_T = TypeVar("_T")
+
+
+class Record:
+    @overload
+    def get(self, key: str) -> Any | None: ...
+    @overload
+    def get(self, key: str, default: _T) -> Any | _T: ...
+    def items(self) -> Iterator[tuple[str, Any]]: ...
+    def keys(self) -> Iterator[str]: ...
+    def values(self) -> Iterator[Any]: ...
+    @overload
+    def __getitem__(self, index: str) -> Any: ...
+    @overload
+    def __getitem__(self, index: int) -> Any: ...
+    @overload
+    def __getitem__(self, index: slice) -> tuple[Any, ...]: ...
+    def __iter__(self) -> Iterator[Any]: ...
+    def __contains__(self, x: object) -> bool: ...
+    def __len__(self) -> int: ...

backend/.venv/lib/python3.12/site-packages/asyncpg/protocol/recordcapi.pxd

@@ -0,0 +1,14 @@
+# Copyright (C) 2016-present the asyncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+
+cimport cpython
+
+
+cdef extern from "record/recordobj.h":
+
+	void ApgRecord_SET_ITEM(object, int, object)
+	object RecordDescriptor(object, object)