from sqlalchemy import create_engine from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import sessionmaker import os SQLALCHEMY_DATABASE_URL = os.getenv("DATABASE_URL", "postgresql://user:password@db/testarena") engine = create_engine(SQLALCHEMY_DATABASE_URL) SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine) Base = declarative_base()