chat.yakka.readMarker

{
  "key": "any",
  "type": "record",
  "record": {
    "type": "object",
    "required": [
      "space",
      "lastSeen",
      "updatedAt"
    ],
    "properties": {
      "space": {
        "type": "string",
        "format": "at-uri",
        "description": "The space this marker is for. Also the record key, so a marker is upserted rather than accumulated."
      },
      "lastSeen": {
        "ref": "com.atproto.repo.strongRef",
        "type": "ref",
        "description": "The last message the viewer has seen, by URI. Deliberately NOT yakka.chat's view sequence: that number is service-local and meaningless to another view (ADR 0012), so the portable form references the message and every app derives its own position. yakka.chat caches the derived sequence for unread math; this record stays the truth."
      },
      "updatedAt": {
        "type": "string",
        "format": "datetime"
      }
    }
  },
  "description": "How far the viewer has read in one space. Lives in the viewer's own chat.yakka.settings space, authority=self (ADR 0017), so read state follows the person across devices and into third-party clients."
}