Refactor database initialization and remove Alembic migrations

- Removed legacy Alembic migration files and consolidated schema management into a new Pydantic-backed initializer (`scripts/init_db.py`).
- Updated `main.py` to ensure the new DB initializer runs on startup, maintaining idempotency.
- Adjusted session management in `config/database.py` to prevent DetachedInstanceError.
- Introduced new enums in `models/enums.py` for better organization and clarity.
- Refactored various models to utilize the new enums, improving code maintainability.
- Enhanced middleware to handle JSON validation more robustly, ensuring non-JSON requests do not trigger JSON errors.
- Added tests for middleware and enums to ensure expected behavior and consistency.
- Updated changelog to reflect significant changes and improvements.

services/bootstrap.py

@@ -162,12 +162,21 @@ def bootstrap_pricing_settings(
                     uow.set_project_pricing_settings(project, default_settings)
                     assigned += 1
 
-    logger.info(
-        "Pricing bootstrap result: slug=%s created=%s updated_fields=%s impurity_upserts=%s projects_assigned=%s",
-        seed_result.settings.slug,
-        seed_result.created,
-        seed_result.updated_fields,
-        seed_result.impurity_upserts,
-        assigned,
-    )
-    return PricingBootstrapResult(seed=seed_result, projects_assigned=assigned)
+        # Capture logging-safe primitives while the UnitOfWork (and session)
+        # are still active to avoid DetachedInstanceError when accessing ORM
+        # instances outside the session scope.
+        seed_slug = seed_result.settings.slug if seed_result and seed_result.settings else None
+        seed_created = getattr(seed_result, "created", None)
+        seed_updated_fields = getattr(seed_result, "updated_fields", None)
+        seed_impurity_upserts = getattr(seed_result, "impurity_upserts", None)
+
+        logger.info(
+            "Pricing bootstrap result: slug=%s created=%s updated_fields=%s impurity_upserts=%s projects_assigned=%s",
+            seed_slug,
+            seed_created,
+            seed_updated_fields,
+            seed_impurity_upserts,
+            assigned,
+        )
+
+        return PricingBootstrapResult(seed=seed_result, projects_assigned=assigned)