{
    "summary": [
        {
            "name": "document_chunks",
            "title": "文档分片",
            "primary": ["id"]
        }
    ],
    "fields": [
        {"name": "id", "title": "ID", "type": "str", "length": 32},
        {"name": "doc_id", "title": "文档ID", "type": "str", "length": 32},
        {"name": "kb_id", "title": "知识库ID", "type": "str", "length": 32},
        {"name": "chunk_index", "title": "分片序号", "type": "int", "default": 0},
        {"name": "chunk_type", "title": "分片类型", "type": "str", "length": 32},
        {"name": "content", "title": "文本内容", "type": "text", "length": 65535},
        {"name": "description", "title": "描述", "type": "text", "length": 65535},
        {"name": "vector_id", "title": "向量库ID", "type": "str", "length": 128},
        {"name": "start_offset", "title": "起始偏移", "type": "int", "default": 0},
        {"name": "end_offset", "title": "结束偏移", "type": "int", "default": 0},
        {"name": "time_start", "title": "时间起始(秒)", "type": "float", "length": 10, "dec": 3},
        {"name": "time_end", "title": "时间结束(秒)", "type": "float", "length": 10, "dec": 3},
        {"name": "metadata", "title": "元数据JSON", "type": "text", "length": 2000},
        {"name": "created_at", "title": "创建时间", "type": "datetime"}
    ],
    "indexes": [
        {"name": "idx_chunk_doc", "idxtype": "index", "idxfields": ["doc_id"]},
        {"name": "idx_chunk_kb", "idxtype": "index", "idxfields": ["kb_id"]},
        {"name": "idx_chunk_vector", "idxtype": "index", "idxfields": ["vector_id"]}
    ]
}