I'm currently working with redis using "set" structure.

I want to know if it's possible to clean automatically empty "set" ?

Else find a cron/process to clean periodically empty "set"

UPDATE:

More generic question, there is a diff (memory usage) between "(nil)" and "(empty list or set)"

example:

sadd x 1
srem x
smembers x
(empty list or set)

or

sadd x 1
del x
smembers x
(nil)
redis
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