Add index for leaderboard entry prop keys+values

[tudddorrr]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.49%. Comparing base (dd97e22) to head (62444d3).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1061   +/-   ##
========================================
  Coverage    98.49%   98.49%           
========================================
  Files          488      488           
  Lines         7833     7834    +1     
  Branches      1026     1027    +1     
========================================
+ Hits          7715     7716    +1     
  Misses          49       49           
  Partials        69       69           

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