refactor(storage): improve filters and docs

[rodrigo-brito]

• Refactor SQL storage filter
• Improve code docs

[codecov-commenter]

Codecov Report

Base: 48.96% // Head: 48.80% // Decreases project coverage by -0.16% ⚠️

Coverage data is based on head (a04432a) compared to base (9d6ff17).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
- Coverage   48.96%   48.80%   -0.17%     
==========================================
  Files          19       19              
  Lines        2510     2502       -8     
==========================================
- Hits         1229     1221       -8     
  Misses       1209     1209              
  Partials       72       72              

Impacted Files	Coverage Δ
storage/sql.go	71.42% <100.00%> (-4.58%)	⬇️

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