ktmud opened a new pull request, #19636:
URL: https://github.com/apache/superset/pull/19636

   ### SUMMARY
   
   Change [SIP-68](https://github.com/apache/superset/pull/17543) db migrations 
to no-op and stop shadow-writing datasets to new models.
   
   We should not include the shadow writing logic to official releases as it 
increases computation costs yet contributes nothing to end user experience (for 
now). Given the original migration is expensive and we [likely need to redo 
it](https://github.com/apache/superset/pull/19421) anyway, it's the best to 
skip it for now.
   
   This PR should only be cherry-picked into the LTS branches such as 1.5 and 
2.0. Once #19421 is ready and the new dataset models started to replace the old 
models, we'll just re-cut the release from `master` and ignore this PR.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   
   ### TESTING INSTRUCTIONS
   <!--- Required! What steps can be taken to manually verify the changes? -->
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Required feature flags:
   - [ ] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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