Feature: owner-aware unique model name constraint

[shamoon]

Proposed change

As was pointed out in the linked discussion, with permissions added, uniqueness by model name should be owner-aware ie two different owners can have the same tag name. The second UniqueConstraint is to handle null owner. Also this is enforced via the API when owner is changed using serializer. Hopefully the test coverage is up-to-snuff.

Please let me know if I've missed anything as I dabble in the backend world.

Fixes #2802

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

Merging #2827 (5e7b93d) into dev (2fe7f8b) will decrease coverage by 0.05%.
The diff coverage is 86.66%.

@@            Coverage Diff             @@
##              dev    #2827      +/-   ##
==========================================
- Coverage   93.14%   93.09%   -0.05%     
==========================================
  Files         149      150       +1     
  Lines        6387     6401      +14     
==========================================
+ Hits         5949     5959      +10     
- Misses        438      442       +4     

Flag	Coverage Δ
backend	93.09% <86.66%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
src/documents/serialisers.py	91.44% <63.63%> (-0.71%)	⬇️
...documenttype_options_alter_tag_options_and_more.py	100.00% <100.00%> (ø)
src/documents/models.py	98.32% <100.00%> (-0.01%)	⬇️

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[shamoon]

Thanks, sorry for not including comments before, that does make it much more understandable

[github-actions]

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