Optimize event processing to avoid N+1 queries

[cursor]

Adds per-request caching for user potato statistics to eliminate redundant SUM queries.

The potatoSentToday and potatoLeftToday methods were executing identical database queries multiple times within a single request. This change introduces a lightweight cache on the User entity, ensuring these methods only query the daily potato count once per request and potatoLeftToday derives its value from the cached potatoSentToday result.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.04%. Comparing base (b6005c8) to head (0f95e26).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #364      +/-   ##
============================================
- Coverage     26.20%   26.04%   -0.16%     
- Complexity      323      324       +1     
============================================
  Files            77       77              
  Lines          3247     3240       -7     
============================================
- Hits            851      844       -7     
  Misses         2396     2396              

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