Doc comments

[mappum]

Added basic doc comment coverage. Will continue pushing later to full coverage.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 36.97%. Comparing base (f3a9322) to head (f364ae2).

Files with missing lines	Patch %	Lines
src/app/migrations.rs	0.00%	2 Missing ⚠️
src/bin/create-checkpoint.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #301      +/-   ##
===========================================
+ Coverage    36.68%   36.97%   +0.28%     
===========================================
  Files           25       23       -2     
  Lines         9510     9437      -73     
===========================================
  Hits          3489     3489              
+ Misses        6021     5948      -73     

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