`wb_terms` with 1.4B rows (with average of 140 bytes per row) is one of the biggest tables on wikidata.org that needs cleanun in several areas:
- Drop `term_entity_id` (and maybe `term_entity_type`) in favor of `term_full_entity_id`
- Normalize `term_entity_type` (item=0, property=1, etc.) if we are not dropping it
- Normalize `term_type` (labe0, etc.)
How we are going to normalize (where to store the mapping) and migration plan needs to be determined.