fix: set timestamp to postgres revision when using optimizedRevisionFunc

[ostafen]

Description

Testing

References

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.53%. Comparing base (f3e150e) to head (747f6e0).

Files with missing lines	Patch %	Lines
internal/datastore/postgres/revisions.go	73.34%	2 Missing and 2 partials ⚠️

❌ Your project check has failed because the head coverage (74.53%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2917      +/-   ##
==========================================
- Coverage   74.54%   74.53%   -0.00%     
==========================================
  Files         484      484              
  Lines       59228    59242      +14     
==========================================
+ Hits        44146    44152       +6     
- Misses      11990    11996       +6     
- Partials     3092     3094       +2     

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