app/db/session.py

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.core.config import settings

engine = create_engine(
    settings.DATABASE_URL,
    pool_pre_ping=True,
    pool_recycle=300,
)
SessionLocal = sessionmaker(autocommit = False, autoflush = False, bind = engine)
Base = declarative_base()

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()