Deletes every key under prefix in this manager's namespace (the whole
namespace without one). With the redis driver and no namespace, only
flushDb: true lets it empty the database.
See KVAdapter.sadd: the member is kept as is, only key is namespaced.
Optionalttl: numberOptionalttl: number
The underlying ioredis client with the "redis" driver, once started: for commands the KV API does not cover (sets, sorted sets, pipelines). It bypasses
namespaceand the JSON codec.undefinedwith the memory driver or before start().