odapi/database/__init__.py

from databases import Database
from sqlalchemy import MetaData, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

from constants import DB

metadata = MetaData()
engine = create_engine(DB, connect_args={"check_same_thread": False})
metadata.create_all(engine)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()
database = Database(DB)