space.highport.manage.setDelegationDefaultTile

Set or clear the tile served on every name reserved under a delegation base whose subject has not yet published a site. The tile is pinned by CID and takes no parameters, so a tile with a required parameter is refused. It never answers /.well-known/atproto-did, which keeps returning the DID the name is reserved for. The base owner pays for the traffic. The caller must own the base, which must have delegation enabled.