public String getDeleteEventHandlerStatement() {
        return QueryBuilder.delete()
                .from(keyspace, TABLE_EVENT_HANDLERS)
                .where(eq(HANDLERS_KEY, HANDLERS_KEY))
                .and(eq(EVENT_HANDLER_NAME_KEY, bindMarker()))
                .getQueryString();
    }
@return cql query statement to delete an event handler by name from the "event_handlers"
    table
cassandra-persistence/src/main/java/com/netflix/conductor/cassandra/util/Statements.java