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"""
Database Configuration and Session Management
Supports BOTH SQLite (local) and PostgreSQL (production on Render)
"""
import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from pathlib import Path
# ============================================
# HYBRID DATABASE SUPPORT
# ============================================
# Priority:
# 1. Use DATABASE_URL from environment (Render PostgreSQL)
# 2. Fallback to SQLite for local development
DATABASE_URL = os.getenv("DATABASE_URL")
if DATABASE_URL:
# CRITICAL FIX FOR RENDER:
# Render provides URLs starting with 'postgres://'
# but SQLAlchemy 1.4+ requires 'postgresql://'
if DATABASE_URL.startswith("postgres://"):
DATABASE_URL = DATABASE_URL.replace("postgres://", "postgresql://", 1)
print(f"🚀 Production Mode: Using PostgreSQL")
# PostgreSQL: No need for check_same_thread
engine = create_engine(
DATABASE_URL,
pool_pre_ping=True, # Verify connections before using
pool_recycle=300, # Recycle connections every 5 minutes
)
else:
# Local development: Use SQLite
print(f"🔧 Development Mode: Using SQLite")
# Create database directory
db_dir = Path("app/database")
db_dir.mkdir(parents=True, exist_ok=True)
DATABASE_URL = "sqlite:///./app/database/rating_prediction.db"
# SQLite: Needs check_same_thread=False for FastAPI
engine = create_engine(
DATABASE_URL,
connect_args={"check_same_thread": False}
)
# Create session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
# Base class for all models
Base = declarative_base()
def get_db():
"""
Dependency to get database session
Used in FastAPI route dependencies
"""
db = SessionLocal()
try:
yield db
finally:
db.close()
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