feat: add missing migration 008 (vitals, rest days, sleep_goal_minutes)

- Creates rest_days table for rest day tracking
- Creates vitals_log table for resting HR + HRV
- Creates weekly_goals table for training planning
- Extends profiles with hf_max and sleep_goal_minutes columns
- Extends activity_log with avg_hr and max_hr columns
- Fixes sleep_goal_minutes missing column error in stats endpoint
- Includes stats error handling in SleepWidget

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/migrations/008_vitals_rest_days.sql

@@ -0,0 +1,59 @@
+-- Migration 008: Vitals, Rest Days, Weekly Goals
+-- v9d Phase 2: Sleep & Vitals Module
+-- Date: 2026-03-22
+
+-- Rest Days
+CREATE TABLE IF NOT EXISTS rest_days (
+    id SERIAL PRIMARY KEY,
+    profile_id UUID NOT NULL REFERENCES profiles(id) ON DELETE CASCADE,
+    date DATE NOT NULL,
+    type VARCHAR(20) NOT NULL CHECK (type IN ('full_rest', 'active_recovery')),
+    note TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT unique_rest_day_per_profile UNIQUE(profile_id, date)
+);
+CREATE INDEX idx_rest_days_profile_date ON rest_days(profile_id, date DESC);
+
+-- Vitals (Resting HR + HRV)
+CREATE TABLE IF NOT EXISTS vitals_log (
+    id SERIAL PRIMARY KEY,
+    profile_id UUID NOT NULL REFERENCES profiles(id) ON DELETE CASCADE,
+    date DATE NOT NULL,
+    resting_hr INTEGER CHECK (resting_hr > 0 AND resting_hr < 200),
+    hrv INTEGER CHECK (hrv > 0),
+    note TEXT,
+    source VARCHAR(20) DEFAULT 'manual' CHECK (source IN ('manual', 'apple_health', 'garmin')),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT unique_vitals_per_day UNIQUE(profile_id, date)
+);
+CREATE INDEX idx_vitals_profile_date ON vitals_log(profile_id, date DESC);
+
+-- Extend activity_log for heart rate data
+ALTER TABLE activity_log
+ADD COLUMN IF NOT EXISTS avg_hr INTEGER CHECK (avg_hr > 0 AND avg_hr < 250),
+ADD COLUMN IF NOT EXISTS max_hr INTEGER CHECK (max_hr > 0 AND max_hr < 250);
+
+-- Extend profiles for HF max and sleep goal
+ALTER TABLE profiles
+ADD COLUMN IF NOT EXISTS hf_max INTEGER CHECK (hf_max > 0 AND hf_max < 250),
+ADD COLUMN IF NOT EXISTS sleep_goal_minutes INTEGER DEFAULT 450 CHECK (sleep_goal_minutes > 0);
+
+-- Weekly Goals (Soll/Ist Wochenplanung)
+CREATE TABLE IF NOT EXISTS weekly_goals (
+    id SERIAL PRIMARY KEY,
+    profile_id UUID NOT NULL REFERENCES profiles(id) ON DELETE CASCADE,
+    week_start DATE NOT NULL,
+    goals JSONB NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT unique_weekly_goal_per_profile UNIQUE(profile_id, week_start)
+);
+CREATE INDEX idx_weekly_goals_profile_week ON weekly_goals(profile_id, week_start DESC);
+
+-- Comments for documentation
+COMMENT ON TABLE rest_days IS 'v9d Phase 2: Rest days tracking (full rest or active recovery)';
+COMMENT ON TABLE vitals_log IS 'v9d Phase 2: Daily vitals (resting HR, HRV)';
+COMMENT ON TABLE weekly_goals IS 'v9d Phase 2: Weekly training goals (Soll/Ist planning)';
+COMMENT ON COLUMN profiles.hf_max IS 'Maximum heart rate for HR zone calculation';
+COMMENT ON COLUMN profiles.sleep_goal_minutes IS 'Sleep goal in minutes (default: 450 = 7h 30min)';

frontend/src/components/SleepWidget.jsx

@@ -24,7 +24,7 @@ export default function SleepWidget() {
   const load = () => {
     Promise.all([
       api.listSleep(1),  // Get last entry
-      api.getSleepStats(7)
+      api.getSleepStats(7).catch(() => null) // Stats optional
     ]).then(([sleepData, statsData]) => {
       setLastNight(sleepData[0] || null)
       setStats(statsData)