fix: Downgrade of revision 678eefb4ab44 throws error

[michael-s-molina]

SUMMARY

Fixes the following error when downgrading revision 678eefb4ab44:

sqlalchemy.exc.OperationalError: (MySQLdb.OperationalError) 
(1553, "Cannot drop index 'idx_user_id_database_id': needed in a foreign key constraint")

Fixes #29789

TESTING INSTRUCTIONS

Make sure you can downgrade the revision.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • 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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.70%. Comparing base (76d897e) to head (2553857).
⚠️ Report is 2419 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/migrations/shared/constraints.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #29799       +/-   ##
===========================================
+ Coverage   60.48%   83.70%   +23.21%     
===========================================
  Files        1931      527     -1404     
  Lines       76236    38012    -38224     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    31819    -14295     
+ Misses      28017     6193    -21824     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	∅ <0.00%> (∅)
javascript	?
mysql	∅ <0.00%> (?)
postgres	∅ <0.00%> (?)
presto	∅ <0.00%> (∅)
python	∅ <0.00%> (∅)
sqlite	∅ <0.00%> (?)
unit	∅ <0.00%> (∅)

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[mistercrunch]

LGTM - though it could be nice to implement as a reusable function def drop_fks_for_table(table_name) in superset/migrations/shared/constraints.py

[michael-s-molina]

LGTM - though it could be nice to implement as a reusable function def drop_fks_for_table(table_name) in superset/migrations/shared/constraints.py

Good point. Done 👍🏼

[sadpandajoe]

@supersetbot label 4.1