Diligence score formula and active-time counting

DEC-0007 - Diligence score formula and active-time counting

Context

Need measurable diligence signals for users with and without explicit goal.

Decision

Diligence hybrid score:

• 40% active submission days/week
• 40% completed exercises/week
• 20% active learning time/week

Active-time rules:

• Count only real interactions (click/type/scroll/audio interaction).
• Auto-pause on inactivity.
• Inactivity timeout: 90 seconds (lenient baseline).
• Resume automatically at first new interaction.

Rationale

Balance consistency and effort while preventing idle-time inflation.