diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 000000000..7a537c2b7
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,60 @@
+# Changelog
+
+## [1.1.0] — 2026-04-06
+
+### Added — AI Insights Overhaul
+
+- **ChatGPT Proxy Integration**: Insights now run through a local openai-oauth proxy using your ChatGPT subscription — no separate API billing required
+- **Admin AI Fallback**: Admins can configure a global API key (OpenAI/OpenRouter) as fallback for users without their own connection
+- **Provider Abstraction**: New `src/lib/ai/` module with pluggable providers (Codex OAuth, Admin Key, None) and automatic failover
+- **Medical Insight Prompts**: 7 specialized prompts based on ESC/ESH 2023, WHO, DGE, and DEGAM guidelines
+  - Blood Pressure: ESC/ESH classification, morning risk ladder (J-HOP), pulse pressure, seasonal variation
+  - Weight: 5%/10% milestone recognition, plateau detection, body composition divergence
+  - Pulse: Fitness interpretation ladder, 80-100 bpm elevated-risk band, rate-pressure product
+  - BMI: Age-adjusted DEGAM classification for 65+
+  - Medication Compliance: Chronotherapy hints, mood-adherence risk prediction, 90-day tracking
+  - General Status: Cross-domain synthesis with cardiovascular risk stratification
+  - Mood: Bidirectional correlations with vitals and adherence
+- **Enriched Feature Extraction**:
+  - Sleep duration and activity steps (previously ignored)
+  - Rate-Pressure Product (pulse × systolic BP, myocardial demand indicator)
+  - Body composition divergence flag (weight stable + body fat rising)
+  - Mood-adherence risk predictor
+  - Seasonal BP variation (winter vs summer, requires >180 days data)
+  - BP standard deviation (sdSys30/sdDia30) as variability risk marker
+  - Pulse pressure (arterial stiffness marker)
+  - 5 cross-metric Pearson correlations (weight↔BP, pulse↔BP, mood↔pulse, mood↔BP, mood↔weight)
+  - 90-day averages and all-time statistics for all metrics
+  - Historical comparison (current 7d vs previous 30d baseline)
+- **New UI Components**:
+  - `InsightStatusCard`: Compact per-metric status card with classification indicator and fade-in animation
+  - `InsightAdvisorCard`: Premium structured card with findings, correlations, recommendations (ready for integration)
+- **OAuth Routes**: `/api/auth/codex/authorize`, `/callback`, `/disconnect` for ChatGPT connection
+- **Admin AI Settings**: `/api/admin/ai-settings` for global API key management
+
+### Changed
+
+- Insight prompts now use personal advisor tone ("dein Blutdruck") with positive-first pattern
+- Reasoning scaffold in system prompt (What changed? → Why? → What to do?)
+- Conditional correlation instructions (only mention when |r| > 0.4)
+- InsightResult schema enriched with `insightType`, `primaryRecommendation`, `classificationLabel`
+- BP target calculation now uses paired readings (both sys AND dia must be in range simultaneously)
+- Medication streak tracking extended from 7-day to 30-day window
+- CSP updated to allow `chatgpt.com` for OAuth flow
+
+### Security
+
+- Rate limiting on all OAuth and admin endpoints
+- PKCE (S256) + state parameter for OAuth CSRF protection
+- Encrypted token storage at rest (AES-256-GCM)
+- Error messages truncated to prevent upstream response body leaks
+- Admin key preview shows last 4 chars of decrypted key (not ciphertext prefix)
+- `prefers-reduced-motion` support for insight card animations
+
+### Removed
+
+- `openaiKeyEncrypted` field from User model (replaced by provider abstraction)
+- Direct OpenAI API calls from insight generators (now routed through provider)
+- Legacy API key input in settings UI (replaced by ChatGPT connect button)
+
+## [1.0.1] — Previous release
diff --git a/package.json b/package.json
index 5a57a4c81..4cd1ceeb2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "private": true,
   "packageManager": "pnpm@10.31.0",
   "scripts": {
diff --git a/src/app/api/insights/generate/route.ts b/src/app/api/insights/generate/route.ts
index d9f4f1ff8..5333f685b 100644
--- a/src/app/api/insights/generate/route.ts
+++ b/src/app/api/insights/generate/route.ts
@@ -14,7 +14,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
   const { user } = await requireAuth();
   const userId = user.id;
 
-  const rl = await checkRateLimit(`insights:${userId}`, 10, 60 * 60 * 1000);
+  const rl = await checkRateLimit(`insights:${userId}`, 2, 60 * 60 * 1000);
   if (!rl.allowed) {
     return apiError("Maximum 2 insight generations per hour.", 429);
   }