Fix pgdb helpers

[AlekSi]

No description provided.

[codecov]

Codecov Report

Merging #425 (335707d) into main (0b17030) will decrease coverage by 0.04%.
The diff coverage is 57.89%.

@@            Coverage Diff             @@
##             main     #425      +/-   ##
==========================================
- Coverage   57.68%   57.63%   -0.05%     
==========================================
  Files         117      117              
  Lines        6031     6043      +12     
==========================================
+ Hits         3479     3483       +4     
- Misses       2037     2043       +6     
- Partials      515      517       +2     

Flag	Coverage Δ
FerretDB	32.20% <21.05%> (-0.06%)	⬇️
MongoDB	2.70% <0.00%> (-0.01%)	⬇️
integration	32.24% <21.05%> (-0.06%)	⬇️
tests	51.19% <57.89%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
internal/handlers/pg/pgdb/pool.go	69.96% <55.55%> (-1.76%)	⬇️
internal/util/testutil/pg.go	89.70% <100.00%> (ø)

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