🛡️ Make app startup resilient - don't fail on Supabase connection issues

✅ FIXES:
- App now starts even if Supabase connection fails
- Master tree database always initializes (146 species)
- Added graceful degradation - runs in 'limited mode' without DB
- Enhanced health endpoint with environment debug info
- Non-blocking startup for better deployment reliability

This ensures the app starts successfully on HuggingFace Spaces even with connection issues,
allowing us to debug the Supabase URL/key problems via the /health endpoint.

app.py

@@ -182,23 +182,31 @@ class TreeUpdate(BaseModel):
 async def startup_event():
     """Initialize application"""
     try:
-        # Test Supabase connection
-        if not db.test_connection():
-            logger.error("Failed to connect to Supabase database")
-            raise Exception("Database connection failed")
-        
-        # Initialize database schema
-        db.initialize_database()
-        
-        # Initialize master tree database
+        # Initialize master tree database (always works - local SQLite)
         create_master_tree_database()
+        logger.info("Master tree database initialized with 146 species")
         
-        # Log success
-        tree_count = db.get_tree_count()
-        logger.info(f"TreeTrack Supabase Edition initialized - {tree_count} trees in database")
+        # Test Supabase connection (non-blocking)
+        try:
+            if db.test_connection():
+                # Initialize database schema if connection works
+                db.initialize_database()
+                
+                # Log success
+                tree_count = db.get_tree_count()
+                logger.info(f"TreeTrack Supabase Edition initialized - {tree_count} trees in database")
+            else:
+                logger.warning("Supabase connection failed - running in limited mode")
+                logger.warning("Database operations will fail until Supabase is configured")
+        except Exception as db_error:
+            logger.error(f"Supabase connection error: {db_error}")
+            logger.warning("App starting in limited mode - only master tree database available")
+        
+        logger.info("TreeTrack application startup complete")
         
     except Exception as e:
-        logger.error(f"Application startup failed: {e}")
+        logger.error(f"Critical application startup failed: {e}")
+        # Only fail if master database fails (shouldn't happen)
         raise
 
 
@@ -210,12 +218,23 @@ async def health_check():
         connection_ok = db.test_connection()
         tree_count = db.get_tree_count() if connection_ok else 0
         
+        # Include environment debug info
+        import os
+        supabase_url = os.getenv("SUPABASE_URL", "NOT_SET")
+        supabase_anon_key = os.getenv("SUPABASE_ANON_KEY", "NOT_SET")
+        
         return {
-            "status": "healthy" if connection_ok else "unhealthy",
-            "database": "connected" if connection_ok else "disconnected",
+            "status": "healthy" if connection_ok else "limited",
+            "database": "connected" if connection_ok else "disconnected", 
             "trees": tree_count,
+            "master_database": "available",
             "timestamp": datetime.now().isoformat(),
             "version": "3.0.0",
+            "environment": {
+                "supabase_url": supabase_url[:50] + "..." if len(supabase_url) > 50 else supabase_url,
+                "supabase_anon_key": "SET" if supabase_anon_key != "NOT_SET" else "NOT_SET",
+                "port": os.getenv("PORT", "7860")
+            }
         }
     except Exception as e:
         logger.error(f"Health check failed: {e}")