Fix Pydantic error in config.py

- Add ClassVar type annotation to DB_DIR to fix the Pydantic validation error
- Update Config to model_config for Pydantic v2 compatibility
- Ensure the Settings class properly handles the database directory path

app/core/config.py

@@ -1,5 +1,5 @@
 from pathlib import Path
-from typing import List
+from typing import ClassVar, List
 
 from pydantic import AnyHttpUrl, EmailStr, validator
 from pydantic_settings import BaseSettings
@@ -16,7 +16,7 @@ class Settings(BaseSettings):
     ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 7  # 7 days
     
     # Database setup
-    DB_DIR = Path("/app") / "storage" / "db"
+    DB_DIR: ClassVar[Path] = Path("/app") / "storage" / "db"
     DB_DIR.mkdir(parents=True, exist_ok=True)
     SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
 
@@ -58,9 +58,10 @@ class Settings(BaseSettings):
             and values.get("EMAILS_FROM_EMAIL")
         )
 
-    class Config:
-        case_sensitive = True
-        env_file = ".env"
+    model_config = {
+        "case_sensitive": True,
+        "env_file": ".env"
+    }
 
 
 settings = Settings()