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

engine = create_engine(
    settings.DATABASE_URL, 
    pool_pre_ping=True,
    pool_recycle=3600,
    connect_args={"check_same_thread": False} if "sqlite" in settings.DATABASE_URL else {}
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

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