docs: Issue #28 completion documentation (v9e)

- Marked Issue #28 as complete
- Documented all 4 original phases
- Documented debug tools added 26.03.2026
- Documented placeholder enhancements (6 new functions, 7 reconstructed)
- Documented bug fixes (PIPELINE_MASTER, SQL columns, type errors)
- Listed related Gitea issues (#43, #44, #45, #46)
- Updated version status to v9e Ready for Production

version: 9.5.0 (documentation update)

CLAUDE.md

@@ -56,7 +56,7 @@ frontend/src/
     └── technical/   # MEMBERSHIP_SYSTEM.md
 ```
 
-## Aktuelle Version: v9d + Issue #28 🚀 Development seit 25.03.2026
+## Aktuelle Version: v9e (Issue #28 Complete) 🚀 Ready for Production 26.03.2026
 
 ### Implementiert ✅
 - Login (E-Mail + bcrypt), Auth-Middleware alle Endpoints, Rate Limiting
@@ -188,7 +188,7 @@ frontend/src/
 
 📚 Details: `.claude/docs/technical/MEMBERSHIP_SYSTEM.md` · `.claude/docs/architecture/FEATURE_ENFORCEMENT.md`
 
-### Issue #28: Unified Prompt System ✅ (Development 25.03.2026)
+### Issue #28: Unified Prompt System ✅ (Completed 26.03.2026)
 
 **AI-Prompts Flexibilisierung - Komplett überarbeitet:**
 
@@ -220,21 +220,88 @@ frontend/src/
 - JSON-Output erzwingbar pro Prompt
 - Cross-Module Korrelationen möglich
 
+**Debug & Development Tools (26.03.2026):**
+- ✅ **Comprehensive Debug System:**
+  - Test-Button in Prompt-Editor mit Debug-Modus
+  - Shows resolved/unresolved placeholders
+  - Displays final prompts sent to AI
+  - Per-stage debug info for pipelines
+  - Export debug data as JSON
+- ✅ **Placeholder Export (per Test):**
+  - Button in Debug-Viewer
+  - Exports all placeholders with values per execution
+- ✅ **Global Placeholder Export:**
+  - Settings → "📊 Platzhalter exportieren"
+  - All 32 placeholders with current values
+  - Organized by category
+  - Includes metadata (description, example)
+- ✅ **Batch Import/Export:**
+  - Admin → "📦 Alle exportieren" (all prompts as JSON)
+  - Admin → "📥 Importieren" (upload JSON, create/update)
+  - Dev→Prod sync in 2 clicks
+
+**Placeholder System Enhancements:**
+- ✅ **6 New Placeholder Functions:**
+  - `{{sleep_avg_duration}}` - Average sleep duration (7d)
+  - `{{sleep_avg_quality}}` - Deep+REM percentage (7d)
+  - `{{rest_days_count}}` - Rest days count (30d)
+  - `{{vitals_avg_hr}}` - Average resting heart rate (7d)
+  - `{{vitals_avg_hrv}}` - Average HRV (7d)
+  - `{{vitals_vo2_max}}` - Latest VO2 Max value
+- ✅ **7 Reconstructed Placeholders:**
+  - `{{caliper_summary}}`, `{{circ_summary}}`
+  - `{{goal_weight}}`, `{{goal_bf_pct}}`
+  - `{{nutrition_days}}`
+  - `{{protein_ziel_low}}`, `{{protein_ziel_high}}`
+  - `{{activity_detail}}`
+- **Total: 32 active placeholders** across 6 categories
+
+**Bug Fixes (26.03.2026):**
+- ✅ **PIPELINE_MASTER Response:** Analysis page now uses unified executor
+  - Fixed: Old `/insights/run` endpoint sent raw template to AI
+  - Now: `/prompts/execute` with proper stage processing
+- ✅ **Age Calculation:** Handle PostgreSQL DATE objects
+  - Fixed: `calculate_age()` expected string, got date object
+  - Now: Handles both strings and date objects
+- ✅ **Sleep Quality 0%:** Lowercase stage names
+  - Fixed: Checked ['Deep', 'REM'], but stored as ['deep', 'rem']
+  - Now: Correct case-sensitive matching
+- ✅ **SQL Column Name Errors:**
+  - Fixed: `bf_jpl` → `body_fat_pct`
+  - Fixed: `brust` → `c_chest`, etc.
+  - Fixed: `protein` → `protein_g`
+- ✅ **Decimal × Float Type Error:**
+  - Fixed: `protein_ziel_low/high` calculations
+  - Now: Convert Decimal to float before multiplication
+
 **Migrations:**
 - Migration 020: Unified Prompt System Schema
 
 **Backend Endpoints:**
-- `POST /api/prompts/execute` - Universeller Executor
+- `POST /api/prompts/execute` - Universeller Executor (with save=true param)
 - `POST /api/prompts/unified` - Create unified prompt
 - `PUT /api/prompts/unified/{id}` - Update unified prompt
+- `GET /api/prompts/export-all` - Export all prompts as JSON
+- `POST /api/prompts/import` - Import prompts from JSON (with overwrite option)
+- `GET /api/prompts/placeholders/export-values` - Export all placeholder values
 
 **UI:**
 - Admin → KI-Prompts: Type-Filter (Alle/Basis/Pipeline)
 - Neuer Prompt-Editor mit dynamischem Stage-Builder
 - Inline editing von Stages + Prompts
+- Test-Button mit Debug-Viewer (always visible)
+- Export/Import Buttons (📦 Alle exportieren, 📥 Importieren)
+- Settings → 📊 Platzhalter exportieren
 
 📚 Details: `.claude/docs/functional/AI_PROMPTS.md`
 
+**Related Gitea Issues:**
+- #28: Unified Prompt System - ✅ CLOSED (26.03.2026)
+- #43: Enhanced Debug UI - 🔲 OPEN (Future enhancement)
+- #44: BUG - Analysen löschen - 🔲 OPEN (High priority)
+- #45: KI Prompt-Optimierer - 🔲 OPEN (Future feature)
+- #46: KI Prompt-Ersteller - 🔲 OPEN (Future feature)
+
 ## Feature-Roadmap
 
 > 📋 **Detaillierte Roadmap:** `.claude/docs/ROADMAP.md` (Phasen 0-3, Timeline, Abhängigkeiten)