Seed: Add homework submissions and calendar events
Added to prisma/seed.ts:
- 21 homework submissions (70% of students submitted, mix of pending/submitted/graded)
with scores and feedback for graded submissions
- 8 calendar events:
Mathetest, Deutschtest, Klassenfahrt, Elternsprechtag,
Mathetest 3b, Lesewettbewerb, Sportfest, Zeugnisausgabe
(exams, reminders, all-day events spread over 5-30 days ahead)
DB now has: 5 users, 15 students, 4 notebooks, 5 homework, 21 submissions,
6 attendance sessions, 45 attendance records, 8 calendar events
Z User
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