BIG-IQ AppIQ Configserver RethinkDb corrupt/broken - how to reset?

It would appear that the AppIQ service on my BIG-IQ is in a loop of trying to initialize.

The /var/log/appiq/configserver.log shows repeat attempts to start up:

2019-04-16 10:22:48,341 INFO c.f.a.c.r.RethinkDbConfig [main] RethinkDb config created with RethinkDB DB name config_db
2019-04-16 10:22:48,686 INFO c.f.a.c.r.RethinkDbConnection [main] New open connection to RethinkDB (hostname: localhost, port:28015, timeout:30)
2019-04-16 10:22:48,784 ERROR c.f.a.c.r.RethinkDbManagement [main] emergencyRepairCluster of table 'null' failed with exception com.rethinkdb.gen.exc.ReqlOpFailedError: Database `config_db` is ambiguous; there are multiple databases with that name.

2019-04-16 10:22:59,231 INFO c.f.a.c.r.RethinkDbConnector [main] RethinkDB database 'config_db' is not created
    2019-04-16 10:22:59,236 ERROR c.f.a.c.r.RethinkDbConnector [main] Max retries exceeded on createTableIfNotExists
    com.rethinkdb.gen.exc.ReqlOpFailedError: Database `config_db` is ambiguous; there are multiple databases with that name.

Would appear on the face of it that I just need to drop/reset the existing RethinkDb but information on how to do this seems to be thin on the ground.

Has anyone encountered similar? If not I'll raise yet another SR with support.