As decided in 2019, the wb_terms is to be replaced by a set of normalized tables
**Production Migration to the set of normalized tables and Dropping the old table**
[x] Early 2019, investigate normalization of wb_terms
[x] Finish not yet done read usecases needed for wikidata.org migration (part of T236979) - T236901, T205194, T236681, T232040, T242096, T242211, T242326
[x] Fixes for writing - T234329, T232393, T234948, T235117, T237984, T233414
[x] T237984 Fix Followups (bad row deletions) T241210, T241209, T241211, T219301, T241212
[x] Complete the Migration on Wikidata (March 2020) {T219175}
[] Switch over Wikibase defaults
[x] Finish not yet done read usecases needed for wikibase migration (part of T236979)
[x] {T242095} TermSearchInteractor (found in T232040#5774510) (needed for Wikibase migration)
[x] 2020 - {T219144}
[] 2020 - {T242723}
[] Drop wb_terms table
[x] Wikidata {T248086}
[] Wikibase
[] Remove the tmp migration configuration options
[] Remove old code
[] DROP wb_terms in wikibase by default
[] Final cleanup
[] TBD Turn on or fix the CirrusSearch Sanitizer job {T239931}
[x] More and better docs for the code {T225857}
[] Refactor DatabaseTermIdsCleaner to make it easier to reason with (TASK TBA)
**Tickets that can be closed once the table is dead**
* Any open tickets on this board: https://phabricator.wikimedia.org/tag/wikidata-ugly-cat-trailblaze_wb_terms_trail_blazing/
* {T86530} - Follows the same sort of idea as this ticket, but has lots of cruft surrounding it, so bets to leave it where it is rather than pull it into a subtask of this task.
* {T199833}
* {T142691} - This will technically not be an issue, as we won't be using wb_terms, but this could re surface with the new schema