wip attempt to fix timestamp unique constraint errors

archivebox/index/sql.py

@@ -39,6 +39,10 @@ def write_sql_main_index(links: List[Link], out_dir: str=OUTPUT_DIR) -> None:
     with transaction.atomic():
         for link in links:
             info = {k: v for k, v in link._asdict().items() if k in Snapshot.keys}
+            try:
+                info['timestamp'] = Snapshot.objects.get(url=link.url).timestamp
+            except Snapshot.DoesNotExist:
+                pass
             Snapshot.objects.update_or_create(url=link.url, defaults=info)
 
 @enforce_types