Performance improvement for notifications API endpoint

[SchrodingersGat]

• URL: http://localhost:8000/api/notifications/?format=json

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.06%. Comparing base (76b298c) to head (c31df31). Report is 311 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7154      +/-   ##
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+ Coverage   83.96%   84.06%   +0.10%     
==========================================
  Files        1057     1046      -11     
  Lines       46495    45834     -661     
  Branches     1360     1175     -185     
==========================================
- Hits        39040    38532     -508     
+ Misses       7102     7027      -75     
+ Partials      353      275      -78     

Flag	Coverage Δ
backend	85.42% <100.00%> (+<0.01%)	:arrow_up:

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[SchrodingersGat]

Ah, this has potential but needs some more work. The actual serialized content varies a lot based on the "target" and "source" content types so the prefetch does not always work...

Might be a good idea to add a "link" field to the notification model so we can cache this data, and not have to do (expensive) lookup.