feat: add helper function to delete old sequences in MongoDB store

[davidsteiner]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.42%. Comparing base (f6015bb) to head (e40e2ac).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
+ Coverage   89.37%   89.42%   +0.04%     
==========================================
  Files          83       83              
  Lines        8038     8072      +34     
==========================================
+ Hits         7184     7218      +34     
  Misses        854      854              

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