PoC: Vertical split for users.incoming_email_token - step 3
requested to merge ka/spikes/430906-vertical-split-incoming_email_token-step-3 into ka/spikes/430906-vertical-split-incoming_email_token-step-2
DO NOT MERGE
What does this MR do and why?
This is PoC example MR on how to do a vertical split for a database table - extract column(s) and index(es) to a new table.
This is step 3 from the process, that does the following:
- Update app to read and write from the new table only
- Ignore the original column ( to start the process of safely removing database column, as described in our guides
See #430906 (closed) for more details.