Admin Settings — date singleton read/write

[roslyn-maloney]

Admin Settings — date singleton read/write

🎫 Issue #485.

▶ Changelist:

• confirmed schema for the singleton data so that it has _id: string, key: SingletonKey, value: unknown, updatedAt: Date, updatedBy: string
• Implemented getSingleton, setSingleton, and validateDateSingleton
• Implemented the GET and POST functions for registration-open, registration-closed and confirm-by routes

🧪 Testing:

• Tested /admin/settings and checked if the dates persisted on save (they did)
• curl localhost:3000/api/v1/dates/registration-open should return { value: null } initially.
• curl -X POST localhost:3000/api/v1/dates/registration-open -d '{"value":"2026-02-15T18:00:00Z"}' should return { ok: true, value: "2026-02-15T18:00:00.000Z" }.
• curl localhost:3000/api/v1/dates/registration-open should now return { value: "2026-02-15T18:00:00.000Z" }.
• curl -X POST localhost:3000/api/v1/dates/registration-open -d '{"value":"not a date"}' should return 400 with an error.
• Did it for registration-closed and confirm-by endpoints

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Project	Deployment	Actions	Updated (UTC)
core-live	Ready	Preview, Comment	Jul 2, 2026 11:38pm
core-main	Ready	Preview, Comment	Jul 2, 2026 11:38pm