ALTER TABLE chat_diff_statuses DROP COLUMN author_login;
ALTER TABLE chat_diff_statuses DROP COLUMN author_avatar_url;
ALTER TABLE chat_diff_statuses DROP COLUMN base_branch;
ALTER TABLE chat_diff_statuses DROP COLUMN pr_number;
ALTER TABLE chat_diff_statuses DROP COLUMN commits;
ALTER TABLE chat_diff_statuses DROP COLUMN approved;
ALTER TABLE chat_diff_statuses DROP COLUMN reviewer_count;