cleaned up models and added more tests

[alexferl]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.09859% with 24 lines in your changes are missing coverage. Please review.

Project coverage is 56.00%. Comparing base (4a39e29) to head (20d62f2).

Files	Patch %	Lines
handlers/mock_PersonalAccessTokenService.go	30.76%	6 Missing and 3 partials ⚠️
models/user.go	81.81%	7 Missing and 1 partial ⚠️
models/personal_access_token.go	83.33%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
+ Coverage   54.04%   56.00%   +1.95%     
==========================================
  Files          38       38              
  Lines        3486     3514      +28     
==========================================
+ Hits         1884     1968      +84     
+ Misses       1344     1288      -56     
  Partials      258      258              

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