Context: {T291829}; the table was used in the old change dispatching system, which we no longer use. (You can see that the `chd_touched` column is frozen in time, not updated since 2021-10-04.)
1. **ALTERs to run:** `DROP TABLE wb_changes_dispatch;`
- or maybe something like `RENAME TABLE wb_changes_dispatch TO T294121_DROP_wb_changes_dispatch`; wait for a bit to ensure that nothing is trying to use the table; then `DROP TABLE T294121_DROP_wb_changes_dispatch` – if you want to be extra safe
2. **Where to run those changes:** wikibaserepo.dblist
- [ ] commonswiki
- [ ] testcommonswiki
- [ ] testwikidatawiki
- [ ] wikidatawiki
3. **When to run those changes:** At any time
4. **If the schema change is backwards compatible:** Yes
5. **If the schema change has been tested already on some of the test/beta wikis:** Yes, dropped via `update.php` in Beta