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from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.config import settings
import logging
logger = logging.getLogger(__name__)
# Create SQLAlchemy engine with better error handling
try:
engine = create_engine(
settings.DATABASE_URL,
pool_pre_ping=True, # Verify connections before using
pool_size=5,
max_overflow=10,
pool_recycle=3600, # Recycle connections after 1 hour
echo=settings.DEBUG, # Log SQL queries in debug mode
connect_args={
"connect_timeout": 10, # Connection timeout in seconds
}
)
logger.info("Database engine created successfully")
except Exception as e:
logger.error(f"Failed to create database engine: {e}")
raise
# Session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
# Base class for models
Base = declarative_base()
# Dependency for FastAPI endpoints
def get_db():
"""
Database session dependency.
Usage: db: Session = Depends(get_db)
"""
db = SessionLocal()
try:
yield db
except Exception as e:
logger.error(f"Database session error: {e}")
db.rollback()
raise
finally:
db.close()
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