fix: optimize rewards query

[AntonAndell]

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• I have performed a self-review of my own code
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.02%. Comparing base (6cc3af0) to head (eb3ca2a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #474      +/-   ##
============================================
- Coverage     73.03%   73.02%   -0.01%     
+ Complexity     1634     1633       -1     
============================================
  Files           120      120              
  Lines          7814     7812       -2     
  Branches        941      942       +1     
============================================
- Hits           5707     5705       -2     
+ Misses         1701     1700       -1     
- Partials        406      407       +1     

Flag	Coverage Δ
java	73.02% <100.00%> (-0.01%)	⬇️

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