feat: implement health statistics tracking (Phase 2.7 Task 2)

- Add HealthStatistics model with 10 stat types
- Implement HealthStatisticsRepository
- Create 6 health stats API endpoints
- Add trend analysis with summary calculations
- Follow medication repository pattern

Status: 60% complete, needs compilation fixes

PHASE_2.7_PROGRESS_SUMMARY.md

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+# Phase 2.7 MVP - Progress Summary
+
+**Date:** 2026-03-07  
+**Status:** 🟡 IN PROGRESS (Task 1 Complete, Task 2 Partial)
+
+---
+
+## ✅ Completed Tasks
+
+### Task 1: Medication Management (100% Complete)
+**Status:** ✅ DEPLOYED & TESTED
+
+**Features Implemented:**
+- ✅ 7 API endpoints fully functional
+- ✅ Database layer with repository pattern
+- ✅ Models (Medication, MedicationDose, MedicationReminder)
+- ✅ JWT authentication & ownership validation
+- ✅ Audit logging for all operations
+- ✅ Adherence tracking calculation
+- ✅ Comprehensive testing (100% pass rate)
+
+**Endpoints Deployed:**
+1. POST /api/medications - Create medication
+2. GET /api/medications - List medications
+3. GET /api/medications/:id - Get specific medication
+4. POST /api/medications/:id - Update medication
+5. POST /api/medications/:id/delete - Delete medication
+6. POST /api/medications/:id/log - Log dose
+7. GET /api/medications/:id/adherence - Get adherence stats
+
+**Test Results:** ✅ All 10/10 tests passing
+- Authentication: ✅
+- CRUD operations: ✅
+- Dose logging: ✅
+- Adherence calculation: ✅
+- Authorization: ✅
+
+---
+
+## 🟡 In Progress Tasks
+
+### Task 2: Health Statistics Tracking (60% Complete)
+**Status:** 🟡 IMPLEMENTATION IN PROGRESS
+
+**What's Done:**
+- ✅ HealthStatistics model with 10 stat types
+- ✅ HealthStatisticsRepository (following medication pattern)
+- ✅ 6 API endpoints defined
+- ✅ Trend analysis with summary calculations
+- ✅ Routes registered in main.rs
+
+**What's Left:**
+- ⚠️ Fix compilation errors (DateTime arithmetic, serialization)
+- ⚠️ Complete handler implementation
+- ⚠️ Testing
+- ⚠️ Deployment to Solaria
+
+**Planned Endpoints:**
+1. POST /api/health-stats - Add health stat
+2. GET /api/health-stats - List stats (by profile & type)
+3. GET /api/health-stats/:id - Get specific stat
+4. PUT /api/health-stats/:id - Update stat
+5. DELETE /api/health-stats/:id - Delete stat
+6. GET /api/health-stats/trends - Get trend data
+
+**Supported Stat Types:**
+- Weight, Height, Blood Pressure, Heart Rate
+- Temperature, Blood Glucose, Oxygen Saturation
+- Sleep Hours, Steps, Calories, Custom
+
+---
+
+## ⚪ Not Started Tasks
+
+### Task 3: Profile Management (0% Complete)
+**Estimated:** 1-2 days
+**Priority:** 🔴 CRITICAL (Multi-person support)
+
+**Required Endpoints:**
+- GET /api/profiles - List user's profiles
+- POST /api/profiles - Create family member profile
+- PUT /api/profiles/:id - Update profile
+- GET /api/profiles/:id/health-stats - Get profile's stats
+- GET /api/profiles/:id/medications - Get profile's meds
+
+### Task 4: Notification System (0% Complete)
+**Estimated:** 3-4 days
+**Priority:** 🔴 CRITICAL (Medication reminders)
+
+**Required Features:**
+- Medication reminders (time-based)
+- Missed dose alerts
+- In-app notifications
+- Email notification support
+
+---
+
+## 📊 Overall Progress
+
+**Completed:** 1 of 5 core tasks (20%)  
+**In Progress:** 1 task (20%)  
+**Not Started:** 3 tasks (60%)
+
+---
+
+## 🎯 Next Steps
+
+### Immediate (Priority 1)
+1. **Complete Health Statistics** (remaining 40%)
+2. **Implement Profile Management** (multi-person support)
+
+### Short-term (Priority 2)
+3. **Notification System** (medication reminders)
+4. **Comprehensive Testing**
+
+---
+
+**Last Updated:** 2026-03-07 16:23 UTC