Fix slow channel members query

[tudddorrr]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.32%. Comparing base (3f67bec) to head (985d26d).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #498      +/-   ##
===========================================
- Coverage    99.32%   99.32%   -0.01%     
===========================================
  Files          198      198              
  Lines        12948    12947       -1     
  Branches      1158     1161       +3     
===========================================
- Hits         12860    12859       -1     
  Misses          86       86              
  Partials         2        2              

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