🔧 Fix: Resolved UNIQUE constraint error in tender synchronization

backend/app/services/sync.py

@@ -24,7 +24,15 @@ async def sync_tenders_to_db(db: Session, keyword: str = None):
     count_new = 0
     count_updated = 0
     
-    for api_t in api_tenders:
+    # Deduplicate API results by code to avoid IntegrityError within the same batch
+    seen_codes = set()
+    unique_tenders = []
+    for t in api_tenders:
+        if t.code not in seen_codes:
+            seen_codes.add(t.code)
+            unique_tenders.append(t)
+    
+    for api_t in unique_tenders:
         # Check if exists
         db_tender = db.query(TenderModel).filter(TenderModel.code == api_t.code).first()