backend/app/database/database.py

from sqlalchemy import create_engine
from sqlalchemy.orm import declarative_base, sessionmaker

from app.core.config import DATABASE_URL

engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
    pool_recycle=300,
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()