• Query params: ?from=DATE&to=DATE
• Response (200): { message: string, data: CheckIn[] }

GET /api/v1/check-in/stats

• Aggregate statistics for dashboard
• Returns mood/pain averages, streak data, etc.
• Response (200): { message: string, data: Stats }

Check-In Data Structure

{
  id: string
  userId: string
  checkInDate: Date          // Date only, not time
  moodScore: number          // 1-10
  painLevel: number          // 1-10
  activities: string[]       // Array of activity names
  notes?: string
  createdAt: Date
  updatedAt: Date
  insights?: Insight[]       // AI-generated insights
}

Feature Specifications

1. Daily Check-In Form

• Mood scale: 1-10 slider
• Pain level: 1-10 slider
• Activities: Multi-select with quick-action suggestions (derived client-side from recent history)
• Notes: Optional text field (up to 1000 characters)
• Smart save: POST upserts (creates or updates same-day entry); use PATCH for explicit partial update
• Form validation with error feedback

2. Activity Suggestions (Client-Side)

Activities are suggested based on recent history:

Algorithm: