Frontend/Backend: Spaced repetitions quizzes

[gao-ti]

• [x] Record score in the DB (e.g., a metric called recall-based accuracy)
• [x] based on timestamp, support repetitions
• [ ] link with the notification function, e.g., you haven't take a quiz for 14 days, would you like to test your strength on chapter 1 of subject 1

[gao-ti]

Suggestion of quiz DB design @arsen-ti

model Quiz {
    id String   @unique
    subject String
    chapter String
    questions Question[]
}

model Question {
    id String   @unique
    difficulty  String
    type    String //mcq, sort, fill in blank

    // mnemonic hints
    image Image[] // Pending - gao-ti
    video Video[]
    testcues TextCue[] // Pending - gao-ti

    // Question string
    questionStr Text
    answerStr   Text
}

[gao-ti]

I'll take spaced repetition from here

[gao-ti]

Arsen's PR merged https://github.com/trilogy-group/memorization-app/pull/64

[gao-ti]

Will use supermemo algorithm for spaced repetition

https://npm.io/package/supermemo

[gao-ti]

Spaced repetition PR raised https://github.com/trilogy-group/memorization-app/pull/98

[gao-ti]

98 merged.

Backend support for spaced repetition completed.

[gao-ti]

Blocked due to lack of question/answer data from the question bank team.

[gao-ti]

https://github.com/trilogy-group/memorization-app/pull/143