improve errors and fix import loop

server/__init__.py

@@ -8,9 +8,9 @@ from fastapi.middleware.trustedhost import TrustedHostMiddleware
 
 from .util.middlewares import TimingMiddleware, ErrorHandlingMiddleware
 from .util.config import settings
+from .data import db_engine
 from .util.logging import get_logger
 from .api import router as api_router
-from .data import db_engine
 
 
 mimetypes.init()

server/api/errors.py

 from fastapi import status as http_status
 
 
+class UserPermissionError(Exception):
+    status = http_status.HTTP_403_FORBIDDEN
+
+
 class DataNotFoundWarning(Warning):
     status = http_status.HTTP_204_NO_CONTENT
 
 
 class NoDataForKeyError(Exception):
-    pass
+    status = http_status.HTTP_410_GONE
 
 
 class ItemNotFoundError(Exception):
-    pass
+    status = http_status.HTTP_404_NOT_FOUND
 
 
 class ProjectNotFoundError(Exception):
-    status = 400
+    status = http_status.HTTP_400_BAD_REQUEST
 
 
 class UserNotFoundError(Exception):