Classify some mysql errors

[serprex]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 7.31707% with 38 lines in your changes missing coverage. Please review.

Project coverage is 52.89%. Comparing base (e66bffe) to head (9c1476d). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
flow/alerting/classifier.go	7.31%	35 Missing and 3 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2870      +/-   ##
==========================================
+ Coverage   52.84%   52.89%   +0.04%     
==========================================
  Files         159      159              
  Lines       23751    23724      -27     
==========================================
- Hits        12552    12549       -3     
+ Misses       9758     9729      -29     
- Partials     1441     1446       +5     

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