From 108b04f1f7a8315d4ab5bbf2624104c0495b8fc4 Mon Sep 17 00:00:00 2001
From: Protocol Zero <257158451+Protocol-zero-0@users.noreply.github.com>
Date: Fri, 12 Jun 2026 22:40:47 +0000
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=20Tier1=20=E5=9C=A8=20Postgr?=
 =?UTF-8?q?es=20=E4=B8=8A=E5=B4=A9=E6=BA=83:=E4=BF=A1=E5=8F=B7=E8=A1=8C?=
 =?UTF-8?q?=E5=90=AB=20datetime=20=E6=97=A0=E6=B3=95=20JSON=20=E5=BA=8F?=
 =?UTF-8?q?=E5=88=97=E5=8C=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

_build_structure_prompt 对原始 DB 行 json.dumps 时,PG 返回的
datetime 对象(SQLite 为字符串)抛 TypeError,Tier1 发现整体失败。
加 default=str 保持双后端一致;附回归测试(datetime 行能进 prompt)。
---
 agents/paradigm_agent.py      |  4 +++-
 tests/test_paradigm_prompt.py | 39 +++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 tests/test_paradigm_prompt.py

diff --git a/agents/paradigm_agent.py b/agents/paradigm_agent.py
index 30c7dfc..1f785c1 100644
--- a/agents/paradigm_agent.py
+++ b/agents/paradigm_agent.py
@@ -263,7 +263,9 @@ def _build_structure_prompt(signals: dict) -> str:
             continue
         sections.append(f"\n## {title}")
         for row in rows[:10]:
-            sections.append(f"- {json.dumps(row, ensure_ascii=True)[:220]}")
+            # Postgres rows carry datetime objects (SQLite returns strings);
+            # default=str keeps prompt building backend-agnostic.
+            sections.append(f"- {json.dumps(row, ensure_ascii=True, default=str)[:220]}")
 
     return "\n".join(sections)
 
diff --git a/tests/test_paradigm_prompt.py b/tests/test_paradigm_prompt.py
new file mode 100644
index 0000000..e514e86
--- /dev/null
+++ b/tests/test_paradigm_prompt.py
@@ -0,0 +1,39 @@
+"""_build_structure_prompt must handle DB rows from both backends.
+
+Postgres returns datetime objects in signal rows where SQLite returns
+strings; prompt building must not crash on either."""
+
+from __future__ import annotations
+
+import os
+import unittest
+from datetime import datetime
+
+os.environ["DEEPGRAPH_DATABASE_URL"] = ""  # force SQLite tmpdir; never touch a real DB from the environment
+
+
+class StructurePromptTest(unittest.TestCase):
+    def test_rows_with_datetime_values(self):
+        from agents.paradigm_agent import _build_structure_prompt
+
+        signals = {
+            "entity_overlaps": [],
+            "pattern_matches": [],
+            "contradiction_clusters": [],
+            "taxonomy_map": [],
+            "hidden_variable_bridges": [
+                {
+                    "entity": "gaussian splatting",
+                    "node_a": "cv.3d",
+                    "node_b": "cv.sfm",
+                    "created_at": datetime(2026, 6, 12, 12, 0, 0),
+                }
+            ],
+        }
+        prompt = _build_structure_prompt(signals)
+        self.assertIn("gaussian splatting", prompt)
+        self.assertIn("2026-06-12", prompt)
+
+
+if __name__ == "__main__":
+    unittest.main()