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.

main.py

@@ -17,6 +17,7 @@ from routes.reports import router as reports_router
 from routes.scenarios import router as scenarios_router
 from monitoring import router as monitoring_router
 from services.bootstrap import bootstrap_admin, bootstrap_pricing_settings
+from scripts.init_db import init_db as init_db_script
 
 app = FastAPI()
 
@@ -44,6 +45,14 @@ async def ensure_admin_bootstrap() -> None:
     admin_settings = settings.admin_bootstrap_settings()
     pricing_metadata = settings.pricing_metadata()
     try:
+        # Ensure DB schema/types/seeds required for bootstrapping exist.
+        # The initializer is idempotent and safe to run on every startup.
+        try:
+            init_db_script()
+        except Exception:
+            logger.exception(
+                "DB initializer failed; continuing to bootstrap (non-fatal)")
+
         role_result, admin_result = bootstrap_admin(settings=admin_settings)
         pricing_result = bootstrap_pricing_settings(metadata=pricing_metadata)
         logger.info(
@@ -54,14 +63,29 @@ async def ensure_admin_bootstrap() -> None:
             admin_result.password_rotated,
             admin_result.roles_granted,
         )
-        logger.info(
-            "Pricing settings bootstrap completed: slug=%s created=%s updated_fields=%s impurity_upserts=%s projects_assigned=%s",
-            pricing_result.seed.settings.slug,
-            pricing_result.seed.created,
-            pricing_result.seed.updated_fields,
-            pricing_result.seed.impurity_upserts,
-            pricing_result.projects_assigned,
-        )
+        # Avoid accessing ORM-managed attributes that may be detached outside
+        # of the UnitOfWork/session scope. Attempt a safe extraction and
+        # fall back to minimal logging if attributes are unavailable.
+        try:
+            seed = pricing_result.seed
+            slug = getattr(seed.settings, "slug", None) if seed and getattr(
+                seed, "settings", None) else None
+            created = getattr(seed, "created", None)
+            updated_fields = getattr(seed, "updated_fields", None)
+            impurity_upserts = getattr(seed, "impurity_upserts", None)
+            logger.info(
+                "Pricing settings bootstrap completed: slug=%s created=%s updated_fields=%s impurity_upserts=%s projects_assigned=%s",
+                slug,
+                created,
+                updated_fields,
+                impurity_upserts,
+                pricing_result.projects_assigned,
+            )
+        except Exception:
+            logger.info(
+                "Pricing settings bootstrap completed (partial): projects_assigned=%s",
+                pricing_result.projects_assigned,
+            )
     except Exception:  # pragma: no cover - defensive logging
         logger.exception(
             "Failed to bootstrap administrator or pricing settings")