cnabro opened a new pull request, #24510:
URL: https://github.com/apache/superset/pull/24510

   ### SUMMARY
   - Data too long for column `json_metadata`
   - Default column size is 65535, we need to increase column size for saving 
dashboard.
   - position_json already changed to `utils.MediumText`
   ```
   (MySQLdb._exceptions.DataError) (1406, "Data too long for column 
'json_metadata' at row 1")
   [SQL: UPDATE dashboards SET changed_on=%s, json_metadata=%s, 
changed_by_fk=%s WHERE dashboards.id = %s]
   ```
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   
   ### TESTING INSTRUCTIONS
   ```sql
   ALTER TABLE dashboards MODIFY json_metadata MEDIUMTEXT;
   ```
   - After modifying the column, it works normally.
   
   ### ADDITIONAL INFORMATION
   - [x] Has associated issue: https://github.com/apache/superset/issues/5532
   - [ ] Required feature flags:
   - [ ] Changes UI
   - [x] 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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