fix: finalize unified schema and correct permission snapshot mapping

backend/scripts/migrate_enum_to_text.sql

@@ -0,0 +1,27 @@
+BEGIN;
+
+-- users / master tables
+ALTER TABLE users ALTER COLUMN status TYPE VARCHAR(16) USING status::text;
+ALTER TABLE companies ALTER COLUMN status TYPE VARCHAR(16) USING status::text;
+ALTER TABLE sites ALTER COLUMN status TYPE VARCHAR(16) USING status::text;
+ALTER TABLE systems ALTER COLUMN status TYPE VARCHAR(16) USING status::text;
+ALTER TABLE modules ALTER COLUMN status TYPE VARCHAR(16) USING status::text;
+ALTER TABLE permission_groups ALTER COLUMN status TYPE VARCHAR(16) USING status::text;
+
+-- api_clients
+ALTER TABLE api_clients ALTER COLUMN status TYPE VARCHAR(16) USING status::text;
+
+-- user scoped permissions
+ALTER TABLE user_scope_permissions ALTER COLUMN action TYPE VARCHAR(32) USING action::text;
+ALTER TABLE user_scope_permissions ALTER COLUMN scope_type TYPE VARCHAR(16) USING scope_type::text;
+
+-- keep check constraint compatible with varchar
+ALTER TABLE user_scope_permissions DROP CONSTRAINT IF EXISTS user_scope_permissions_check;
+ALTER TABLE user_scope_permissions
+  ADD CONSTRAINT user_scope_permissions_check
+  CHECK (
+    ((scope_type = 'company' AND company_id IS NOT NULL AND site_id IS NULL)
+     OR (scope_type = 'site' AND site_id IS NOT NULL AND company_id IS NULL))
+  );
+
+COMMIT;