Function use_mutation 

pub fn use_mutation<Q>(mutation: Mutation<Q>) -> UseMutation<Q>
where
    Q: MutationCapability,

Available on crate feature query only.

Mutations are used to update data asynchronously of an e.g external resources such as HTTP APIs.

Clean time

This is how long will the mutation result be kept cached after there are no more subscribers of that mutation.

See Mutation::clean_time.