Labels optimization recommended in code review.

[getvictor]

Fixes #29596

[codecov]

Codecov Report

❌ Patch coverage is 61.11111% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.76%. Comparing base (ccbdf6c) to head (36f3687).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
server/datastore/mysql/labels.go	61.11%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #31856      +/-   ##
==========================================
- Coverage   63.77%   63.76%   -0.01%     
==========================================
  Files        1966     1966              
  Lines      192528   192529       +1     
  Branches     6285     6285              
==========================================
- Hits       122785   122775      -10     
- Misses      60136    60141       +5     
- Partials     9607     9613       +6     

Flag	Coverage Δ
backend	65.15% <61.11%> (-0.01%)	⬇️

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