diff --git a/models/document_chunks.json b/models/document_chunks.json
index 9037e1a..c545831 100644
--- a/models/document_chunks.json
+++ b/models/document_chunks.json
@@ -17,8 +17,8 @@
         {"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", "dec": 3},
-        {"name": "time_end", "title": "时间结束(秒)", "type": "float", "dec": 3},
+        {"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"}
     ],