message: database: drop the old GitHub stats
diff: @@ -529,7 +529,33 @@ pub fn migrate(version: Option<Version>, conn: &mut Client) -> CratesfyiResult<(
  ALTER TABLE releases DROP COLUMN github_repo;
  DROP TABLE github_repos;
  "
  - )
  + ),
  + migration!(
  + context,
  + 23,
  + // description
  + "Delete old GitHub stats",
  + // upgrade query
  + "
  + ALTER TABLE crates
  + DROP COLUMN github_description,
  + DROP COLUMN github_stars,
  + DROP COLUMN github_forks,
  + DROP COLUMN github_issues,
  + DROP COLUMN github_last_commit,
  + DROP COLUMN github_last_update;
  + ",
  + // downgrade query
  + "
  + ALTER TABLE crates
  + ADD COLUMN github_description VARCHAR(1024),
  + ADD COLUMN github_stars INTEGER NOT NULL DEFAULT 0,
  + ADD COLUMN github_forks INTEGER DEFAULT 0,
  + ADD COLUMN github_issues INTEGER DEFAULT 0,
  + ADD COLUMN github_last_commit TIMESTAMP,
  + ADD COLUMN github_last_update TIMESTAMP;
  + "
  + ),
  ];
  for migration in migrations {
  