2617 slow editor add index

[rorymckinley]

Description

This adds 2 indexes for foreign keys. Given the urgency expressed around having a solution to the editor load times, I am pushing the low-hanging fruit out early rather than waiting for a complete solution.

Future discoveries/changes may make these indexes redundant.

This is why this PR does not close the issue.

#2617

Validation steps

Nothing really - other than the indexes, there are no functional changes in this PR.

Additional notes for the reviewer

Apparently, Pizza Hut started with thin base pizza because the founders only knew how to make the dough needed for French bread - which results in a thin base pizza. Before then pizzas had thicker bases.

AI Usage

Please disclose how you've used AI in this work (it's cool, we just want to know!):

• Code generation (copilot but not intellisense)
• Learning or fact checking
• Strategy / design
• Optimisation / refactoring
• Translation / spellchecking / doc gen
• Other
• I have not used AI

You can read more details in our Responsible AI Policy

Pre-submission checklist

• I have performed a self-review of my code.
• I have implemented and tested all related authorization policies. (e.g., :owner, :admin, :editor, :viewer)
• I have updated the changelog.
• I have ticked a box in "AI usage" in this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.41%. Comparing base (f0f6111) to head (114f3d1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2849      +/-   ##
==========================================
+ Coverage   91.39%   91.41%   +0.02%     
==========================================
  Files         340      340              
  Lines       12267    12267              
==========================================
+ Hits        11211    11214       +3     
+ Misses       1056     1053       -3     

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