{
  "summary": [
    {
      "name": "pbl_evidence",
      "comment": "学习证据（幂等采集，唯一索引防重）",
      "module": "pbl_evidence",
      "engine": "mariadb",
      "charset": "utf8mb4",
      "tenant_scoped": true
    }
  ],
  "fields": [
    {
      "name": "tenant_id",
      "comment": "租户ID(强制打头)",
      "null": false,
      "type": "str",
      "length": 32
    },
    {
      "name": "id",
      "comment": "主键",
      "null": false,
      "type": "int",
      "length": 20,
      "unsigned": true,
      "auto_increment": true
    },
    {
      "name": "artifact_id",
      "comment": "产出物",
      "null": false,
      "type": "bigint"
    },
    {
      "name": "evidence_type",
      "comment": "证据类型",
      "null": false,
      "type": "str",
      "length": 64
    },
    {
      "name": "source_event_id",
      "comment": "来源 runtime_event",
      "null": false,
      "type": "str",
      "length": 32
    },
    {
      "name": "session_id",
      "comment": "会话",
      "null": false,
      "type": "bigint"
    },
    {
      "name": "learner_id",
      "comment": "学习者",
      "null": false,
      "type": "str",
      "length": 32
    },
    {
      "name": "blueprint_id",
      "comment": "蓝图",
      "null": false,
      "type": "bigint"
    },
    {
      "name": "payload_json",
      "comment": "证据体",
      "null": true,
      "type": "json"
    },
    {
      "name": "occurred_at",
      "comment": "发生时间",
      "null": false,
      "type": "datetime"
    },
    {
      "name": "dedup_key",
      "comment": "去重键",
      "null": false,
      "type": "str",
      "length": 32
    },
    {
      "name": "created_at",
      "comment": "创建时间",
      "null": false,
      "type": "datetime"
    },
    {
      "name": "updated_at",
      "comment": "更新时间",
      "null": false,
      "type": "datetime"
    }
  ],
  "indexes": [
    {
      "name": "uk_ev_dedup",
      "unique": true,
      "fields": [
        "tenant_id",
        "source_event_id",
        "evidence_type"
      ]
    },
    {
      "name": "idx_ev_learner",
      "unique": false,
      "fields": [
        "tenant_id",
        "learner_id"
      ]
    },
    {
      "name": "PRIMARY",
      "unique": true,
      "fields": [
        "id"
      ]
    }
  ],
  "codes": [
    {
      "field": "evidence_type",
      "appcode": "pbl_evidence_type"
    }
  ]
}