database migration framework

[ghubertpalo]

Content

This PR provides a database model layer & stores the database schematic version in the database.

Pre-submit checklist

• Branch
  • [X] Tests are provided (if possible)
  • [X] Commit sequence broadly makes sense
  • [X] Key commits have useful messages
• PR
  • [ ] No clippy warnings in the CI
  • [ ] Self-reviewed the diff
  • [ ] Useful pull request description
  • [ ] Reviewer requested
• Documentation
  • [ ] Update README file (if relevant)
  • [ ] Update documentation website (if relevant)
  • [ ] Add dev blog post (if relevant)

Comments

Issue(s)

Relates to #YYY or Closes #YYY

[github-actions[bot]]

Unit Test Results

    3 files  ±0    28 suites  ±0   3m 2s :stopwatch: +27s 335 tests +9  335 :heavy_check_mark: +9  0 :zzz: ±0  0 :x: ±0  388 runs  +9  388 :heavy_check_mark: +9  0 :zzz: ±0  0 :x: ±0 

Results for commit c5d2dfe5. ± Comparison against base commit 0bff212a.

:recycle: This comment has been updated with latest results.