DELETE /v2/social-media/{id}

The active uploader may remove their own media, including after losing parent visibility or chat membership. The database tombstone immediately denies later byte reads; private object removal is retried separately. Repeating deletion of an owned ID returns 204. Bound slots retain exactly id, ordinal and deleted:true; deleting the last image preserves a media-only parent. Message removal advances message/chat versions without changing sequence, read cursor or unread count. Clients should refresh visible history when the chat version changes. This operation remains available when new media writes are disabled.