{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:orbiplex:schema:messaging.retention-decided:v1",
  "title": "MessagingRetentionDecided v1",
  "description": "Messaging-owned Layer 3 fact recording an explicit message or thread retention decision.",
  "type": "object",
  "additionalProperties": true,
  "x-dia-workflow": "project",
  "x-dia-status": "draft",
  "x-dia-basis": ["doc/project/40-proposals/060-messaging-middleware.md"],
  "required": [
    "schema",
    "schema/v",
    "fact/id",
    "event/at",
    "target",
    "decision/kind",
    "decided/by"
  ],
  "properties": {
    "schema": { "const": "messaging.retention-decided.v1" },
    "schema/v": { "const": 1 },
    "fact/id": {
      "type": "string",
      "pattern": "^fact:messaging.retention-decided:[a-z0-9][a-z0-9:-]*$"
    },
    "event/at": { "type": "string", "format": "date-time" },
    "target": {
      "type": "object",
      "additionalProperties": false,
      "minProperties": 1,
      "properties": {
        "message/id": { "type": "string", "minLength": 1 },
        "thread/id": { "type": "string", "minLength": 1 },
        "mailbox/id": { "type": "string", "minLength": 1 }
      }
    },
    "decision/kind": {
      "type": "string",
      "enum": ["keep-local", "archive", "delete", "exported"]
    },
    "decided/by": { "type": "string", "minLength": 1 },
    "reason": { "type": "string", "minLength": 1 },
    "archive/ref": { "type": "string", "minLength": 1 }
  }
}