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+# Phase 08-01: Health Monitoring & Logging Infrastructure
+
+**Status:** ✅ **COMPLETE**
+
+**Completed:** 2026-03-03 21:30 UTC
+
+---
+
+## 📋 Deliverables Summary
+
+### 1. ✅ Structured Logging (Winston)
+- **Implementation:** Winston logger with multiple transports
+- **Location:** `backend/src/utils/logger.js`
+- **Features:**
+  - Console output with color coding (development)
+  - File output to `logs/combined.log` (all levels)
+  - File output to `logs/error.log` (errors only)
+  - Automatic log rotation (5MB max, 5 files)
+  - Structured JSON logging for parsing
+
+**Log Levels Configured:**
+- `debug` — Development-only detailed info
+- `info` — General information and events
+- `warn` — Warning conditions
+- `error` — Error events
+
+### 2. ✅ Enhanced Health Endpoint
+- **Endpoint:** `GET /api/health`
+- **Location:** `backend/src/index.js`
+- **Response Fields:**
+  ```json
+  {
+    "status": "healthy",
+    "uptime": 3600,
+    "timestamp": "2026-03-03T21:30:00.000Z",
+    "database": {
+      "connected": true,
+      "responseTime": "15ms"
+    }
+  }
+  ```
+- **Status Values:**
+  - `healthy` — All systems operational (HTTP 200)
+  - `degraded` — Some systems degraded (HTTP 200)
+  - `unhealthy` — Critical systems down (HTTP 503)
+
+**Capabilities:**
+- Real-time uptime tracking (seconds since startup)
+- Database connectivity verification
+- Database response time measurement
+- Graceful error handling with fallback responses
+
+### 3. ✅ Request Logging Middleware
+- **Implementation:** `backend/src/middleware/requestLogger.js`
+- **Integration:** Applied globally to all HTTP requests
+- **Logged Fields:**
+  - `method` — HTTP method (GET, POST, etc.)
+  - `path` — Request path
+  - `statusCode` — Response status code
+  - `duration` — Request processing time in milliseconds
+  - `ip` — Client IP address
+  - `userAgent` — Browser/client information
+
+**Example Log Output:**
+```
+2026-03-03 21:30:15 [info] HTTP Request { 
+  method: 'POST', 
+  path: '/api/auth/register', 
+  statusCode: 200, 
+  duration: '125ms',
+  ip: '127.0.0.1',
+  userAgent: 'Mozilla/5.0...'
+}
+```
+
+### 4. ✅ Structured Operation Logging
+All critical operations now log structured data:
+
+**Authentication Events:**
+```
+logger.info('User registered', { userId, email })
+logger.info('User logged in', { userId, email })
+logger.warn('Login failed - user not found', { email })
+logger.warn('Login failed - invalid password', { userId })
+```
+
+**Data Modifications:**
+```
+logger.info('Measurements added', { userId })
+logger.info('Strength record added', { userId })
+logger.info('Custom workout created', { userId, workoutId })
+logger.info('Workout log deleted', { userId, date })
+```
+
+**Error Handling:**
+```
+logger.error('Database error', { error: err.message })
+logger.error('Profile error', { error, userId })
+```
+
+### 5. ✅ Comprehensive Documentation
+- **File:** `backend/README.md`
+- **New Sections:**
+  - "Logging & Monitoring" — Overview and configuration
+  - "Structured Logging (Winston)" — Logger details
+  - "Request Logging Middleware" — How requests are logged
+  - "Accessing Logs" — Commands to view logs
+  - "Health Check" — Endpoint documentation with examples
+
+---
+
+## 🧪 Testing & Verification
+
+### Tests Implemented
+- **File:** `backend/test/health.test.js`
+- **Coverage:**
+  - ✅ Health endpoint returns valid status
+  - ✅ Uptime is tracked correctly
+  - ✅ Database connectivity is checked
+  - ✅ Error handling for DB failures
+  - ✅ Request logging middleware functions
+
+### Verification Results
+```
+✓ Syntax check passed (all modules)
+✓ Health status functional
+✓ Uptime tracking working
+✓ Database connectivity verified
+✓ Response times measured correctly
+✓ Logs directory ready
+```
+
+### Test Run Results
+```
+✓ Health status: healthy
+✓ Database connected: true
+✓ Timestamp: 2026-03-03T20:29:01.473Z
+✓ Response time: 2ms
+✅ All health monitoring tests passed!
+```
+
+---
+
+## 📁 Files Changed/Created
+
+### New Files
+1. `backend/src/utils/logger.js` — Winston logger configuration
+2. `backend/src/utils/health.js` — Health monitoring utilities
+3. `backend/src/middleware/requestLogger.js` — HTTP request logging
+4. `backend/test/health.test.js` — Health endpoint tests
+
+### Modified Files
+1. `backend/src/index.js` — Integrated logger, health endpoint, middleware
+2. `backend/package.json` — Added Winston dependency
+3. `backend/README.md` — Added comprehensive logging documentation
+4. `.pm-checkpoint.json` — Updated status and next phase
+
+### Directories Created
+- `backend/logs/` — For runtime log files
+- `backend/src/utils/` — Utility modules
+- `backend/src/middleware/` — Middleware modules
+
+---
+
+## 🔧 Dependencies Added
+
+```json
+{
+  "winston": "^3.x.x"
+}
+```
+
+Winston provides:
+- Structured logging with multiple transports
+- Automatic file rotation
+- Color-coded console output
+- JSON formatting for logs
+
+---
+
+## 🚀 How to Use
+
+### View Logs (Development)
+```bash
+cd backend
+npm run dev              # Console logs in real-time
+tail -f logs/combined.log
+tail -f logs/error.log
+```
+
+### View Logs (Docker)
+```bash
+docker logs -f gravl-backend
+docker logs --tail 100 gravl-backend
+```
+
+### Test Health Endpoint
+```bash
+curl http://localhost:3001/api/health | jq .
+
+# Expected response:
+# {
+#   "status": "healthy",
+#   "uptime": 3600,
+#   "timestamp": "2026-03-03T21:30:00.000Z",
+#   "database": {
+#     "connected": true,
+#     "responseTime": "15ms"
+#   }
+# }
+```
+
+### Monitor Request Logs
+```bash
+grep "HTTP Request" logs/combined.log
+grep "User logged in" logs/combined.log
+grep "error" logs/error.log
+```
+
+---
+
+## 📊 Project Status
+
+- **Phase:** 08-01
+- **Completion:** 100%
+- **Project Overall:** ~90% complete (85% + this phase)
+- **Production Ready:** ✅ Yes
+- **Deployment Ready:** ✅ Yes
+
+---
+
+## ✅ Checklist
+
+- [x] Winston structured logging configured
+- [x] Logger module created with file rotation
+- [x] Health endpoint enhanced with uptime & database status
+- [x] Request logging middleware implemented
+- [x] All critical operations use structured logging
+- [x] Console.log/console.error replaced with logger
+- [x] Documentation complete in README.md
+- [x] Tests passing for health and logging
+- [x] Error handling with graceful fallbacks
+- [x] Logs directory initialized
+- [x] Committed: "feat(08-01): Health monitoring & logging infrastructure"
+
+---
+
+## 📝 Commit History
+
+```
+9f4362a - chore(08-01): Update checkpoint - Health monitoring complete
+e09017d - feat(08-01): Health monitoring & logging infrastructure
+```
+
+---
+
+## 🎯 Next Steps
+
+Recommended next phases in order:
+
+1. **Phase 08-02: Database Backups & Recovery**
+   - Automated backup scripts
+   - Recovery procedures
+   - Backup verification
+
+2. **Phase 08-03: Security Hardening**
+   - API security review
+   - HTTPS enforcement
+   - Input validation
+
+3. **Phase 08-04: Frontend Optimization**
+   - Build optimization
+   - Caching strategies
+   - Performance monitoring
+
+---
+
+**Implementation Complete** ✅
+**All deliverables met** ✅
+**Production ready** ✅
+
+---
+
+*Phase 08-01 completed on 2026-03-03 at 21:30 UTC*