PoC: Vertical split for users.incoming_email_token - step 1
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 1 from the process, that does the following:
- Creates new table
user_incoming_email_settings
- Updates the app to:
- read from the new table
- with fallback to the original column
users.incoming_email_token
- with fallback to the original column
- write to the new table
- read from the new table
- Starts back-filling the new table
See #430906 (closed) for more details.
Edited by Krasimir Angelov