fix: database migration

[morremeyer]

We now connect to the database once with foreign keys disabled in sqlite to allow the migration.
gorm will still update the foreign keys as required.

Then we reconnect with foreign keys enabled and go from there.

This has the added benefit of making the tests easier to read and maintain.

Resolves #970.

[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 81.74%. Comparing base (48031b2) to head (6854f09).

Files	Patch %	Lines
pkg/models/database.go	45.45%	3 Missing and 3 partials ⚠️
main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #980      +/-   ##
==========================================
- Coverage   81.81%   81.74%   -0.07%     
==========================================
  Files          51       51              
  Lines        3718     3726       +8     
==========================================
+ Hits         3042     3046       +4     
- Misses        549      551       +2     
- Partials      127      129       +2     

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