database.py

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

import os

load_dotenv()

username = os.getenv('username')
password = os.getenv('password')
host = os.getenv('host')
port = os.getenv('port')
database_name = os.getenv('database_name')

SQLALCHEMY_DATABASE_URL = f"postgresql://{username}:{password}@{host}:{port}/{database_name}"

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

Base = declarative_base()

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