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connecting str / database url
import os
USER = os.getenv("DB_USER")
PASSWORD = os.getenv("DB_PASSWORD")
HOST = os.getenv("DB_HOST")
PORT = os.getenv("DB_PORT")
NAME = os.getenv("DB_NAME")
SQLALCHEMY_URL = (
f"postgresql+psycopg2://{USER}:{PASSWORD}@{HOST}:{PORT}/{NAME}"
)