db/database.py

import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

# Get database URL from environment variable
DATABASE_URL = os.getenv(
    "DATABASE_URL", 
    "postgresql://postgres:password@localhost:5432/food_ingredients"
)

# Create engine
engine = create_engine(DATABASE_URL)

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

# Create base class for models
Base = declarative_base()

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