app/database.py

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from dotenv import load_dotenv
import os

load_dotenv()

DATABASE_URL = os.getenv("DATABASE_URL")

if not DATABASE_URL:
    raise RuntimeError("DATABASE_URL environment variable is not set.")

engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=True,      
    pool_recycle=300,      
    pool_size=5,
    max_overflow=10,
)

SessionLocal = sessionmaker(
    autocommit=False,
    autoflush=False,
    bind=engine
)

Base = declarative_base()

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