fix(SPV-1101): wrong SQL alias _id in aggregate function (admin stats endpoint)

[yarex-4chain]

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[github-actions]

Manual Tests

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[github-actions]

Manual Tests

💚 Manual testing by @wregulski resulted in success.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.62%. Comparing base (3312ad9) to head (8325991).

Files with missing lines	Patch %	Lines
engine/datastore/models.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #743      +/-   ##
==========================================
+ Coverage   46.60%   46.62%   +0.01%     
==========================================
  Files         328      328              
  Lines       13378    13378              
==========================================
+ Hits         6235     6237       +2     
+ Misses       6569     6567       -2     
  Partials      574      574              

Flag	Coverage Δ
unittests	46.62% <0.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
engine/datastore/models.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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