Flash out API test suite

backend/app/models/departure.py

@@ -1,9 +1,7 @@
 from sqlalchemy import Column, BigInteger, String, Integer, Text, DateTime, Enum as SQLEnum, func
-from sqlalchemy.ext.declarative import declarative_base
 from enum import Enum
 from datetime import datetime
-
-Base = declarative_base()
+from app.db.session import Base
 
 
 class SubmissionSource(str, Enum):