add last seen field to client (fixes #400)

[eternal-flame-AD]

This PR fixes #400 by adding a last seen field to the client model. The last seen field is updated on connection & every pong response.

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: -0.21% ⚠️

Comparison is base (a444182) 85.97% compared to head (a3ce298) 85.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #582      +/-   ##
==========================================
- Coverage   85.97%   85.76%   -0.21%     
==========================================
  Files          45       45              
  Lines        1590     1616      +26     
==========================================
+ Hits         1367     1386      +19     
- Misses        140      145       +5     
- Partials       83       85       +2     

Files Changed	Coverage Δ
auth/authentication.go	69.14% <42.85%> (-1.79%)	⬇️
router/router.go	85.98% <57.14%> (-2.14%)	⬇️
api/stream/stream.go	100.00% <100.00%> (ø)
database/application.go	91.66% <100.00%> (+0.36%)	⬆️
database/client.go	91.30% <100.00%> (+0.39%)	⬆️

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[jmattheis]

Nice to see another PR from you (:

[eternal-flame-AD]

Thanks for the review, its been some time since I was active here. Yeah I should have read #400 more carefully you are correct we are discussing more about token last used instead of client alive-or-not.

[jmattheis]

👍 I've also extracted the ui code for the last used cell to a separate file.