Optional ReadonlycreateCreate an item under the collection this address names, from the request body. The row narrows every value through codecs exactly as a patch does, and answers the minted id.
Optional ReadonlyremoveRemove the item this address names. The row drives its ONE store — the same store its fields read — and answers what actually happened.
Optional ReadonlyripplesThe instances whose state a create/remove at this address changed BESIDE it — a scene's
deletion changes /scenes, a mute group's deletion changes its ex-members' composed mute.
Declared here, EXECUTED by the registry, exactly as RippleTarget is for a patch.
For a REMOVE the registry NAMES the targets before the door runs and re-projects them after: a removal's consequences are defined by what the item still was, and a deleted mute group asked afterwards who its members were would answer the empty set. For a CREATE the address is the collection, which exists on both sides, so it is read once after.
The lifecycle doors a row declares. Both are optional and independent: a send is removable but not creatable (its address is the pair, which always exists); a scene library is both.