core: Add unique constraint to user UUID

[sdimovv]

Details

• Does this resolve an issue?
  N/A

Changes

New Features

• Add unique constraind to user UUID.

Breaking Changes

N/A

Additional

Even though a collision is extremely unlikely, the UUID field is not the primary key, so it needs to be explicitly set to be unique.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.21 🎉

Comparison is base (a566856) 91.57% compared to head (39adeb3) 92.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5004      +/-   ##
==========================================
+ Coverage   91.57%   92.77%   +1.21%     
==========================================
  Files         501      501              
  Lines       25617    25617              
==========================================
+ Hits        23456    23764     +308     
+ Misses       2161     1853     -308     

Flag	Coverage Δ
e2e	52.62% <100.00%> (+0.98%)	⬆️
integration	26.46% <100.00%> (?)
unit	89.57% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
authentik/core/models.py	92.39% <100.00%> (ø)

... and 20 files with indirect coverage changes

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