fix: Database operational error for sessions

- Switched back `SESSION_SQLALCHEMY_TABLE` and `SESSION_CLEANUP_N_REQUESTS` configuration
- `flask_session` extension is now generating the `sessions` table without issues
- Database permission issue resolved by clearing corrupt database volumes and running `flask db init`/`upgrade` manually

Re-initialized test environment via setup commands.

app.py

@@ -138,6 +138,8 @@ def initialize_extensions(app: Flask) -> None:
     # Session
     app.config['SESSION_TYPE'] = 'sqlalchemy'
     app.config['SESSION_SQLALCHEMY'] = db
+    app.config['SESSION_SQLALCHEMY_TABLE'] = 'sessions'
+    app.config['SESSION_CLEANUP_N_REQUESTS'] = None
     Session(app)
     
     # Ensure secret key is set