code: def search_last_modified_unique_identities(db, after):
      
      with db.connect() as session:
          query = session.query(UniqueIdentity.uuid).\
              filter(UniqueIdentity.last_modified >= after)
          uids = [uid.uuid for uid in query.order_by(UniqueIdentity.uuid).all()]
  
      return uids
docs: Look for the uuids of unique identities modified on or
      after a given date.
  
      This function returns the uuids of unique identities
      modified on the given date or after it. The result is a
      list of uuids unique identities.
  
      :param db: database manager
      :param after: look for identities modified on or after this date
  
      :returns: a list of uuids of unique identities modified