{
  "summary": [
    {
      "name": "pbl_evidence",
      "title": "学习证据表",
      "primary": ["id"],
      "catelog": "entity"
    }
  ],
  "fields": [
    {"name": "id", "title": "主键", "type": "str", "length": 32, "nullable": "no"},
    {"name": "tenant_id", "title": "租户ID(强制打头)", "type": "str", "length": 32, "nullable": "no", "default": "0"},
    {"name": "artifact_id", "title": "归属产出物ID(0=无强归属)", "type": "str", "length": 32, "nullable": "no", "default": "0"},
    {"name": "evidence_type", "title": "证据类型", "type": "str", "length": 64, "nullable": "no", "default": "observation"},
    {"name": "source_event_id", "title": "来源runtime_event事件ID", "type": "str", "length": 32, "nullable": "no"},
    {"name": "session_id", "title": "会话ID", "type": "str", "length": 32, "nullable": "no", "default": "0"},
    {"name": "learner_id", "title": "学习者ID", "type": "str", "length": 32, "nullable": "no", "default": "0"},
    {"name": "blueprint_id", "title": "蓝图ID", "type": "str", "length": 32, "nullable": "no", "default": "0"},
    {"name": "payload_json", "title": "证据体(序列化JSON文本)", "type": "text", "nullable": "yes"},
    {"name": "occurred_at", "title": "发生时间", "type": "datetime", "nullable": "no"},
    {"name": "dedup_key", "title": "去重键(md5(tenant|event|type))", "type": "str", "length": 32, "nullable": "no", "default": ""},
    {"name": "collect_batch_id", "title": "采集批次ID", "type": "str", "length": 32, "nullable": "no", "default": ""},
    {"name": "created_at", "title": "创建时间(应用层写入)", "type": "datetime", "nullable": "no"},
    {"name": "updated_at", "title": "更新时间(应用层写入)", "type": "datetime", "nullable": "no"}
  ],
  "indexes": [
    {"name": "uk_ev_dedup", "idxtype": "unique", "idxfields": ["tenant_id", "source_event_id", "evidence_type"]},
    {"name": "idx_ev_learner", "idxtype": "index", "idxfields": ["tenant_id", "learner_id", "occurred_at"]},
    {"name": "idx_ev_artifact", "idxtype": "index", "idxfields": ["tenant_id", "artifact_id"]},
    {"name": "idx_ev_type_time", "idxtype": "index", "idxfields": ["tenant_id", "evidence_type", "occurred_at"]},
    {"name": "idx_ev_batch", "idxtype": "index", "idxfields": ["tenant_id", "collect_batch_id"]}
  ],
  "codes": [
    {"field": "evidence_type", "table": "appcodes_kv", "valuefield": "k", "textfield": "v", "cond": "parentid='pbl_evidence_type'"},
    {"field": "artifact_id", "table": "pbl_artifact", "valuefield": "id", "textfield": "title"},
    {"field": "blueprint_id", "table": "pbl_blueprint", "valuefield": "id", "textfield": "title"}
  ]
}