env_regulation_api/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.SQLALCHEMY_DATABASE_URL,
    pool_pre_ping=True,
    pool_size=1000,
    max_overflow=2000,
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()