Fix infinite loop in import script

backend/import_setlists_smart.py

@@ -56,18 +56,29 @@ def main():
         matched_count = 0
         
         page = 1
+        seen_ids_in_run = set()
+        
         while True:
             # Fetch batch of shows
             print(f"   Fetching shows page {page}...", end="\r", flush=True)
             data = fetch_json("shows", {"page": page}) # Fetch all shows (artist filter can be flaky)
             if not data:
                 break
-                
+            
+            # Check for API loop (if Page X returns same content as Page 1)
+            first_id_in_batch = data[0].get('show_id') if data else None
+            if first_id_in_batch and first_id_in_batch in seen_ids_in_run:
+                print(f"\n   Loop detected at page {page} (ID {first_id_in_batch} seen before). Breaking.")
+                break
+
             for s in data:
                 # We only need Goose shows (artist_id=3 usually, but we check date match)
                 s_date = s.get('showdate')
                 s_id = s.get('show_id')
                 
+                if s_id:
+                    seen_ids_in_run.add(s_id)
+                
                 if s_date and s_id:
                     db_id = date_to_db_id.get(s_date)
                     if db_id: