function clearStorageFileDB() { return StorageFile.deleteMany(); }
function clearBusinessUserDB() { return BusinessUser.deleteMany(); }
function clearUserDB() { return User.deleteMany(); }
function clearOfferDB() { return Offer.deleteMany(); }
function clearFavouriteOffersDB() { return FavouriteOffers.deleteMany(); }
function clearBusinessDB() { return Business.deleteMany(); }
function clearCategoryDB() { return Category.deleteMany(); }