core/database.py

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

engine = create_engine(
    settings.DATABASE_URL,
    pool_size=settings.DB_POOL_SIZE,
    max_overflow=settings.DB_MAX_OVERFLOW,
    echo=settings.DEBUG,
    pool_pre_ping=True,
    pool_recycle=1800
)

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

def get_db():
    """Database session dependency"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()