fix: remove timestamps from flake model

[joseph-sentry]

we don't require these fields for the Flake model

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.98%. Comparing base (e41a4a1) to head (cde158f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #456      +/-   ##
==========================================
- Coverage   90.57%   89.98%   -0.60%     
==========================================
  Files         400      324      -76     
  Lines       12499     9213    -3286     
  Branches     2103     1634     -469     
==========================================
- Hits        11321     8290    -3031     
+ Misses       1069      860     -209     
+ Partials      109       63      -46     

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