Fix Pydantic validation error by adding ClassVar annotation to DB_DIR

app/core/config.py

@@ -1,4 +1,5 @@
 from pathlib import Path
+from typing import ClassVar
 
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
@@ -18,7 +19,7 @@ class Settings(BaseSettings):
     ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
 
     # Database settings
-    DB_DIR = Path("/app") / "storage" / "db"
+    DB_DIR: ClassVar[Path] = Path("/app") / "storage" / "db"
     SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
 
 

migrations/env.py

@@ -1,6 +1,6 @@
 import sys
-from pathlib import Path
 from logging.config import fileConfig
+from pathlib import Path
 
 from alembic import context
 from sqlalchemy import engine_from_config, pool
@@ -9,7 +9,8 @@ from sqlalchemy import engine_from_config, pool
 project_root = Path(__file__).parent.parent
 sys.path.insert(0, str(project_root))
 
-from app.db.base import Base
+# Import after adding to path to avoid ModuleNotFoundError
+from app.db.base import Base  # noqa: E402
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.