Difference between deleteContact and deleteRecipient

[bublath]

I'm currently enabling these methods for my application via Dbus, but I struggle to understand the actual effect.
Can someone explain the difference, effect and use cases?
Mostly I guess people would use it for cleanup and it seems to me I'd simply would need to call both.

Assumption:
deleteContact just removes things like your own alias name (setContact) and not much more
deleteRecipient removes everything including established trust, stored message data... (so does it supercede deleteContact so I only need to call this?)

[AsamK]

That's pretty much it, deleteContact just deletes the local contact information like name, color and message expiration time. It can be used to not sync a contact to linked devices anymore.
deleteRecipient additionally deletes everything else linked to the contact, like session, sender keys and identity. The only thing not deleted by deleteRecipient is group membership information.
After a recipient has been deleted, incoming messages from this recipient will trigger decryption errors, because the session is missing.