Fix clashing DB txn name (#15070)

* Fix clashing DB txn name

* Newsfile

changelog.d/15070.misc

+Fix clashing database transaction name.

synapse/storage/databases/main/end_to_end_keys.py

@@ -262,7 +262,7 @@ class EndToEndKeyWorkerStore(EndToEndKeyBackgroundStore, CacheInvalidationWorker
 
         for batch in batch_iter(signature_query, 50):
             cross_sigs_result = await self.db_pool.runInteraction(
-                "get_e2e_cross_signing_signatures",
+                "get_e2e_cross_signing_signatures_for_devices",
                 self._get_e2e_cross_signing_signatures_for_devices_txn,
                 batch,
             )