feat: Ensures related access is deleted after user/device deletion

[frgfm]

This PR ensures that once a user or a device is deleted, its corresponding access is deleted as well.

I had to change the table definitions in unittests since accesses were sometimes not consistent with device/user tables.

[codecov]

Codecov Report

Merging #76 (b701b75) into master (129ff9d) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   91.36%   91.41%   +0.05%     
==========================================
  Files          23       23              
  Lines         683      687       +4     
==========================================
+ Hits          624      628       +4     
  Misses         59       59              

Flag	Coverage Δ
unittests	91.41% <100.00%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
src/app/db/tables.py	100.00% <ø> (ø)
src/app/api/routes/devices.py	100.00% <100.00%> (ø)
src/app/api/routes/users.py	100.00% <100.00%> (ø)

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[florianriche]

I just have a comment that is a question/Warning. If my comment is useless, then let's merge this PR

EDIT: Should we not delete user/device when deleting an access as well?

[frgfm]

I just have a comment that is a question/Warning. If my comment is useless, then let's merge this PR

EDIT: Should we not delete user/device when deleting an access as well?

I wondered as well, but I felt it was quite dangerous. Only admin should be able to delete accesses directly, so I thought that self deletion of user/device should trigger the deletion of their access, but the other way is quite dangerous. But if you have a suggestion, happy to check it!