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notifications-api/app/dao/rates_dao.py

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from sqlalchemy import desc
from app import db
from app.models import Rates
def get_rate_for_type_and_date(notification_type, date_sent):
return db.session.query(Rates).filter(Rates.notification_type == notification_type,
Rates.valid_from <= date_sent
).order_by(Rates.valid_from.desc()
).limit(1).first()