[WIP]{session, memory}: simplify duplicate logic in the new service through refactoring

[nomand-zc]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 97.91667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.78329%. Comparing base (86472bd) to head (30f2f43).

Files with missing lines	Patch %	Lines
session/postgres/service.go	88.88889%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main        #758         +/-   ##
===================================================
+ Coverage   87.65179%   87.78329%   +0.13149%     
===================================================
  Files            281         281                 
  Lines          36564       36491         -73     
===================================================
- Hits           32049       32033         -16     
+ Misses          2934        2869         -65     
- Partials        1581        1589          +8     

Flag	Coverage Δ
unittests	87.78329% <97.91667%> (+0.13149%)	⬆️

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