WIP: Migrate peewee users to sqlite

[xylix]

We could notify users that sqlite is the only supported backend going forward, or we could migrate config files via a script.

@ErikBjare Do you have any input on which way we should approach making existing users migrate?

[codecov[bot]]

Codecov Report

Merging #86 into master will decrease coverage by 0.22%. The diff coverage is 20%.

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
- Coverage   90.78%   90.55%   -0.23%     
==========================================
  Files          34       34              
  Lines        1606     1610       +4     
  Branches      249      250       +1     
==========================================
  Hits         1458     1458              
- Misses        113      116       +3     
- Partials       35       36       +1

Impacted Files	Coverage Δ
aw_datastore/migration.py	63.15% <20%> (-7.44%)	:arrow_down:

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[lgtm-com[bot]]

This pull request fixes 1 alert when merging 9c9fd0096951bd586c15409922e9314aaf6ed5e5 into f43bbf47d2f192e1d104babff94e2aa8f9f5f226 - view on LGTM.com

fixed alerts:

• 1 for Unused import

[lgtm-com[bot]]

This pull request fixes 1 alert when merging fb1506abfb194714ea2a0bf56c8086b6dae7cec3 into f43bbf47d2f192e1d104babff94e2aa8f9f5f226 - view on LGTM.com

fixed alerts:

• 1 for Unused import

[xylix]

Closed because we're moving most users to aw-server-rust soon enough that this won't be necessary