TODO

- student enrollment/approval
- flow
- introduce migrations
- model docs

- Time mark creation
- Time mark validation
- Time mark validation after creation
- Sign in doesn't work

Ideas:

- Liveness (preview/TAs-only?)
- Live feedback box
- Instant flow request
- Instant flow results
- For-credit availability
- Live chat via candy?
- Leave feedback
- extra time?
- Student tags, adapt homepage

- Flow group ordering, max page count, question/page tags

Rejected ideas
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- Minimum visit times