fix(data-process): 修正详情统计字段契约

backend/tests/test_data_process_store.py

@@ -1,13 +1,27 @@
 from __future__ import annotations
 
+from decimal import Decimal
+
 import pytest
 
 from app.modules.data_process.store import (
     DataProcessStoreError,
+    _decode_row,
     _source_storage_descriptor,
 )
 
 
+def test_decode_row_serializes_postgres_numeric_values_as_json_numbers() -> None:
+    decoded = _decode_row(
+        {
+            "progress": Decimal("100.00"),
+            "duration_seconds": Decimal("389.000000"),
+        }
+    )
+
+    assert decoded == {"progress": 100.0, "duration_seconds": 389.0}
+
+
 def test_source_storage_descriptor_accepts_owned_local_and_legacy_db_references() -> None:
     task_id = "dpt_task"
     source_file_id = "dpsf_source"