[1.7.0] Backport "Fix source_app.utils.normalize_timestamps"

[zenmonkeykstop]

Status

Ready for review

Description of Changes

Backports #5724.

Testing

• base is release/1.7.0
• contains only Fix source_app.utils.normalize_timestamps #5724's commits
• CI passes.

[codecov-io]

Codecov Report

Merging #5727 (85f6e5a) into release/1.7.0 (ab4db41) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           release/1.7.0    #5727   +/-   ##
==============================================
  Coverage          85.58%   85.58%           
==============================================
  Files                 52       52           
  Lines               3773     3773           
  Branches             471      471           
==============================================
  Hits                3229     3229           
  Misses               439      439           
  Partials             105      105           

Impacted Files	Coverage Δ
securedrop/source_app/utils.py	92.10% <100.00%> (ø)

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[rmol]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.58%. Comparing base (ab4db41) to head (85f6e5a).
⚠️ Report is 39 commits behind head on release/1.7.0.
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Additional details and impacted files

@@              Coverage Diff               @@
##           release/1.7.0    #5727   +/-   ##
==============================================
  Coverage          85.58%   85.58%           
==============================================
  Files                 52       52           
  Lines               3773     3773           
  Branches             471      471           
==============================================
  Hits                3229     3229           
  Misses               439      439           
  Partials             105      105           

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