fix: Wrap internal migrations in transactions to handle errors.

[EdgyEdgemond]

closes #4

See #3 for more detail on the underlying issues fixed in this PR.

Thanks to @lexi-k for the initial PR.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.60%. Comparing base (7b9a1c3) to head (752e392).

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   97.53%   97.60%   +0.07%     
==========================================
  Files           8        8              
  Lines         405      417      +12     
  Branches       51       52       +1     
==========================================
+ Hits          395      407      +12     
  Misses          6        6              
  Partials        4        4              

Flag	Coverage Δ
unittests	97.60% <100.00%> (+0.07%)	⬆️

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