{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "CASAN ChatTurn MVP-0",
  "type": "object",
  "required": [
    "seq",
    "timestamp",
    "chat_id",
    "turn_id",
    "tenant_id",
    "actor",
    "mode",
    "decision",
    "user_msg_ref",
    "answer_ref",
    "prev_hash",
    "record_hash"
  ],
  "properties": {
    "seq": { "type": "integer", "minimum": 1 },
    "timestamp": { "type": "string" },
    "chat_id": { "type": "string" },
    "turn_id": { "type": "string" },
    "tenant_id": { "type": "string" },
    "actor": { "type": "string" },
    "mode": { "enum": ["READ_ONLY", "BLOCK", "NOT_SUPPORTED"] },
    "decision": { "enum": ["ANSWERED", "DENIED", "NOT_SUPPORTED"] },
    "user_msg_ref": { "type": "string" },
    "answer_ref": { "type": "string" },
    "sources": { "type": "array" },
    "prev_hash": { "type": "string" },
    "record_hash": { "type": "string" }
  }
}