{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://memind.local/schemas/timeline-item.v1.schema.json",
  "title": "TimelineItem",
  "description": "Temporal Recall 统一时间线条目 — 跨 Source 归一化模型",
  "type": "object",
  "required": [
    "timeline_item_id",
    "user_id",
    "source",
    "type",
    "observed_time",
    "title",
    "content",
    "importance",
    "confidence",
    "source_ref",
    "status"
  ],
  "additionalProperties": false,
  "properties": {
    "timeline_item_id": {
      "type": "string",
      "format": "uuid",
      "description": "归一化后的 timeline 条目 ID"
    },
    "user_id": {
      "type": "string",
      "format": "uuid"
    },
    "source": {
      "type": "string",
      "enum": ["calendar", "chat", "meinput", "memory_v2", "email", "browser", "tasks", "git", "location", "notes"]
    },
    "type": {
      "type": "string",
      "enum": ["event", "todo", "decision", "mention", "commitment"]
    },
    "event_time": {
      "type": ["string", "null"],
      "format": "date-time",
      "description": "事件计划/实际发生时间；未知时为 null"
    },
    "observed_time": {
      "type": "string",
      "format": "date-time",
      "description": "首次被记录/输入/提到的时间"
    },
    "title": {
      "type": "string",
      "maxLength": 512
    },
    "content": {
      "type": "string",
      "maxLength": 8192
    },
    "importance": {
      "type": "number",
      "minimum": 0,
      "maximum": 1
    },
    "confidence": {
      "type": "number",
      "minimum": 0,
      "maximum": 1,
      "description": "抽取/归一化置信度"
    },
    "recall_score": {
      "type": "number",
      "minimum": 0,
      "maximum": 1,
      "description": "最终召回排序分"
    },
    "source_ref": {
      "type": "string",
      "maxLength": 512,
      "description": "源系统引用，如 meinput:segment:<id>"
    },
    "participants": {
      "type": "array",
      "items": { "type": "string", "maxLength": 128 },
      "default": []
    },
    "status": {
      "type": "string",
      "enum": ["planned", "completed", "mentioned", "unknown"]
    },
    "merged_from": {
      "type": "array",
      "items": { "type": "string", "maxLength": 512 },
      "description": "Dedupe 合并前的 source_ref 列表"
    },
    "app_bundle_id": {
      "type": ["string", "null"],
      "description": "MeInput 来源 App"
    },
    "app_name": {
      "type": ["string", "null"]
    },
    "metadata": {
      "type": "object",
      "additionalProperties": true
    }
  }
}