database.py

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

from config import DATABASE_URL

# check_same_thread is SQLite-only; skip for PostgreSQL
_connect_args = {}
if DATABASE_URL.startswith("sqlite"):
    _connect_args["check_same_thread"] = False

engine = create_engine(
    DATABASE_URL,
    connect_args=_connect_args,
    pool_pre_ping=True,         # reconnect stale connections (important for Supabase)
    pool_recycle=300,            # recycle connections every 5 min
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


class Base(DeclarativeBase):
    pass


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