fix: Incident autoresolved

[diegovb-sys]

Closes #5325

📑 Description

The current implementation doesn't seem to cover the idea behind the last resolved and first resolved. Moreover, based on a Postgres environment there is a Warning/Error because of the use of HAVING/GROUP_BY

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

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[shahargl]

lgtm

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Project	Deployment	Preview	Comments	Updated (UTC)
keep	Ready	Preview	Comment	Sep 30, 2025 5:01am

[codecov]

Codecov Report

❌ Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.52%. Comparing base (57ca737) to head (3d9346d).
⚠️ Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
keep/api/core/db.py	0.00%	18 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5338       +/-   ##
===========================================
- Coverage   46.64%   30.52%   -16.13%     
===========================================
  Files         175      101       -74     
  Lines       18263    11680     -6583     
===========================================
- Hits         8519     3565     -4954     
+ Misses       9744     8115     -1629     

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