text: ALTER TABLE imports DROP COLUMN errors;
  ALTER TABLE imports DROP COLUMN started_at;
  ALTER TABLE imports DROP COLUMN stopped_at;
  
  ALTER TABLE imports ADD COLUMN status text DEFAULT 'ready';
  ALTER TABLE imports ADD COLUMN status_message text;
  
  ALTER TABLE nodes ADD COLUMN import_data_id integer REFERENCES data_staging(id) ON DELETE SET NULL;
  ALTER TABLE edges ADD COLUMN import_data_id integer REFERENCES data_staging(id) ON DELETE SET NULL;
  