Add comprehensive admin features and multi-system integration

- Add admin dashboard with sync controls and data browser
- Implement RMM, Auvik, and Addigy organization mappings
- Add chunked ticket sync with progress tracking
- Implement entity sync service with rate limiting
- Add analytics engine and performance optimizer
- Create data browser for all PSA entities
- Add navigation components and UI improvements
- Implement background processing and sync services
- Add comprehensive documentation and migration scripts
- Update configuration items with multi-system support
- Enhance contact management and purchase history
- Add issue type assignment and LLM analyzer
- Improve error handling and logging utilities

FIX_TICKET_SYNC.md

@@ -0,0 +1,52 @@
+# Quick Fix for Ticket Sync Constraint Error
+
+## The Problem
+```
+Database error: insert or update on table "tickets" violates foreign key constraint "tickets_assigned_resource_id_fkey"
+```
+
+## The Fix (2 Steps)
+
+### Step 1: Run Database Migration
+```bash
+docker exec pulse-app psql $DATABASE_URL -f /app/migrations/008_relax_tickets_resource_constraints.sql
+```
+
+### Step 2: Restart the App (to load new code)
+```bash
+docker-compose restart app
+```
+
+## Test the Fix
+```bash
+# Trigger a ticket sync
+curl -X POST http://localhost:3000/api/sync/entity \
+  -H "Content-Type: application/json" \
+  -d '{"entities": ["tickets"], "yearsBack": 1, "triggeredBy": "admin"}'
+
+# Watch the logs
+docker logs -f pulse-app
+```
+
+## What Changed
+
+**Database:**
+- Made resource foreign keys deferrable and lenient
+- Tickets can now exist even if assigned resource doesn't exist
+- Invalid resource IDs are set to NULL instead of causing failure
+
+**Application:**
+- Validates resource IDs before inserting tickets
+- Logs warnings for tickets with invalid resource references
+- Caches valid resource IDs for performance
+
+## Expected Results
+
+✅ Ticket sync completes successfully  
+✅ Warnings logged for tickets with invalid resource IDs  
+✅ Those tickets have `assigned_resource_id` set to NULL  
+✅ All other ticket data is preserved  
+
+## More Details
+
+See `/opt/stacks/pulse/docs/TICKET_SYNC_FIX.md` for complete documentation.