text: ALTER TABLE agency_location_lsc_mapping
      ALTER COLUMN library_id DROP NOT NULL;
  
  ALTER TABLE agency_location_lsc_mapping
      ALTER COLUMN location_id DROP NOT NULL;
  
  ALTER TABLE agency_location_ac_mapping
      ALTER COLUMN library_id DROP NOT NULL;
  
  ALTER TABLE agency_location_ac_mapping
      ALTER COLUMN location_id DROP NOT NULL;
  