Update PostgresStorageAdapter.js

[vitaly-t]

refactoring deleteClass.

[codecov]

Codecov Report

Merging #3869 into master will increase coverage by 0.56%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3869      +/-   ##
==========================================
+ Coverage   89.62%   90.19%   +0.56%     
==========================================
  Files         114      114              
  Lines        7550     7549       -1     
==========================================
+ Hits         6767     6809      +42     
+ Misses        783      740      -43

Impacted Files	Coverage Δ
...dapters/Storage/Postgres/PostgresStorageAdapter.js	95.45% <100%> (-0.01%)	⬇️
src/Push/PushWorker.js	94.54% <0%> (+1.81%)	⬆️
src/Adapters/Cache/InMemoryCache.js	100% <0%> (+7.69%)	⬆️
src/Adapters/Cache/RedisCacheAdapter.js	91.48% <0%> (+85.1%)	⬆️

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[vitaly-t]

The failure seems to be due to an unreliable test, not change-related.

[flovilmart]

Yeah, we got that test that keep failing for no good reasons.

[flovilmart]

@vitaly-t thanks for the improvement!