Adds explicit last_login on User

[cyrillkuettel]

Please fill in the commit message below and work through the checklist. You can delete parts that are not needed, e.g. the optional description, the link to a ticket or irrelevant options of the checklist.

Commit message

Adds explicit last_login on User

TYPE: Feature
LINK: OGC-2454

Checklist

• I have performed a self-review of my code

[linear]

OGC-2454 Eigenes Feld für Last Login auf User

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.38%. Comparing base (9581090) to head (be1d0ac).
⚠️ Report is 23 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/user/auth/core.py	92.09% <100.00%> (+0.04%)	⬆️
src/onegov/user/models/user.py	98.49% <100.00%> (+0.01%)	⬆️

... and 4 files with indirect coverage changes

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[Daverball]

Looks good to me.

We may be able to do a little bit better with the migration, by pre-populating the new column using any stored session timestamps, if you'd like to try. (users.data['sessions'][...]['timestamp'])