backend/app/database.py

"""
Database configuration and session management
"""
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from .config import get_settings

settings = get_settings()

# Create database engine
# Handle SQLite vs PostgreSQL
if settings.database_url.startswith("sqlite"):
    engine = create_engine(
        settings.database_url,
        connect_args={"check_same_thread": False}
    )
else:
    engine = create_engine(
        settings.database_url,
        pool_pre_ping=True,
        pool_size=10,
        max_overflow=20
    )

# Session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Base class for models
Base = declarative_base()


def get_db():
    """Dependency to get database session"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db():
    """Initialize database tables"""
    Base.metadata.create_all(bind=engine)