The same "uuid-name" appeared on an earlier "insert" or
"declare" operation within this transaction.
+
+comment
+.......
+
+
+Request object members:
+
+ "op": "comment" required
+ "comment": <string> required
+
+Result object members:
+
+ none
+
+Semantics:
+
+ Provides information to a database administrator on the purpose of
+ a transaction. The OVSDB server, for example, adds comments in
+ transactions that modify the database to the database journal.