diff --git a/docs/aamas-proceedings.md b/docs/aamas-proceedings.md
index aa730db..04ed984 100644
--- a/docs/aamas-proceedings.md
+++ b/docs/aamas-proceedings.md
@@ -9,7 +9,7 @@
 
 排除 3 个 keynote；research 的 p238 明确标注 `Retracted June 8, 2026`，完整题名、作者、栏目、日期、原文和来源回执保存在采集报告 `held_publications` 中，**不会输出 accepted 或 withdrawn 投稿记录**。当前决定模型没有独立 retracted 状态，后续须单独建模和核验；原始证据不能删除。任何新增或改变的撤稿标记都会停止采集，等待人工核查。
 
-另一个 extended abstract p3178 明确标注 `Withdrawn June 8, 2026`，输出 `withdrawn` 和日期 `2026-06-08`，不补造其此前的接受决定或 PDF 链接。因此 639 个输出条目是 **638 accepted、1 withdrawn**，按六个 track 分组：`proceedings_unspecified` 522、`aaai_transfer` 19、`blue_sky` 17、`doctoral` 34、`demo` 44、`jaamas` 3。全文/扩展摘要是发表形式，不是研究类型；research 栏目不能证明每篇原始 main/special 投稿轨道。JAAMAS 保留期刊展示语义，不制造另一次独立审稿录用。
+另一个 extended abstract p3178 明确标注 `Withdrawn June 8, 2026`，输出 `withdrawn`，在 metadata 保留日期 `2026-06-08` 和日精度；原网页没有时区/时刻，不能伪造决定 timestamp，不补造其此前的接受决定或 PDF 链接。因此 639 个输出条目是 **638 accepted、1 withdrawn**，按六个 track 分组：`proceedings_unspecified` 522、`aaai_transfer` 19、`blue_sky` 17、`doctoral` 34、`demo` 44、`jaamas` 3。全文/扩展摘要是发表形式，不是研究类型；research 栏目不能证明每篇原始 main/special 投稿轨道。JAAMAS 保留期刊展示语义，不制造另一次独立审稿录用。
 
 [AAAI 转投详细政策](https://cyprusconferences.org/aamas2026/call-for-papers-aaai-track/) 要求基于 AAAI-26 rejected 稿件；[总览](https://cyprusconferences.org/aamas2026/calls/) 却写 AAAI-25，须保留冲突。采集器保留 AAAI 栏目归属，不据此生成原 AAAI 投稿 ID、年份或逐篇拒稿决定。目录不是原始决定 note，未来关联仍需逐篇证据。
 
diff --git a/paper_atlas/collectors/aamas2026.py b/paper_atlas/collectors/aamas2026.py
index 02be581..c8f908f 100644
--- a/paper_atlas/collectors/aamas2026.py
+++ b/paper_atlas/collectors/aamas2026.py
@@ -143,8 +143,6 @@ def parse_contents(html, evidence):
                         'raw_decision': retractions[0] if withdrawn else 'listed in official AAMAS 2026 published proceedings '+heading,
                         'metadata': metadata,
                         'tags': [{'namespace': 'aamas_proceedings:publication_format', 'value': publication_format}]})
-        if withdrawn:
-            records[-1]['decision_date'] = '2026-06-08'
     if headers != list(SECTIONS) or dict(counts) != {k: v[3] for k, v in SECTIONS.items()}:
         raise ValueError('Publisher section inventory differs from reviewed 2026 layout')
     if (len(records), len(excluded), len(held)) != (639, 3, 1):
diff --git a/tests/test_aamas2026.py b/tests/test_aamas2026.py
index 0508b88..09e923b 100644
--- a/tests/test_aamas2026.py
+++ b/tests/test_aamas2026.py
@@ -3,10 +3,12 @@ import hashlib
 import json
 from pathlib import Path
 import tempfile
+import sqlite3
 import unittest
 from unittest.mock import patch
 
 from paper_atlas.collectors import aamas, aamas2026
+from paper_atlas.ingestion.records import ingest_file
 
 
 FIXTURE = json.loads(gzip.decompress((Path(__file__).parent/'fixtures/aamas2026-fixture.json.gz').read_bytes()))
@@ -47,12 +49,33 @@ class Aamas2026Tests(unittest.TestCase):
         rows, _, _ = self.parse()
         row, = [r for r in rows if r['external_id'] == '2026/p3178']
         self.assertEqual(row['status'], 'withdrawn')
-        self.assertEqual(row['decision_date'], '2026-06-08')
+        self.assertEqual(row['metadata']['withdrawal_date'], '2026-06-08')
+        self.assertNotIn('decision_date', row)
         self.assertEqual(row['raw_decision'], 'Withdrawn June 8, 2026')
         self.assertNotIn('paper_url', row['metadata'])
         self.assertEqual(row['metadata']['publication_state'], 'withdrawn')
         self.assertEqual(sum(r['status'] == 'accepted' for r in rows), 638)
 
+    def test_withdrawal_ingestion_retains_date_precision_without_invented_acceptance(self):
+        rows, _, _ = self.parse()
+        row, = [r for r in rows if r['external_id'] == '2026/p3178']
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp); path = root/'withdrawn.jsonl'; db = root/'sample.sqlite'
+            path.write_text(json.dumps(row, ensure_ascii=False)+'\n')
+            path.with_suffix('.manifest.json').write_text(json.dumps({
+                'source': 'aamas_proceedings', 'list_url': aamas2026.URL,
+                'venue': 'AAMAS', 'year': 2026, 'track': row['track'],
+                'count': 1, 'status': 'partial', 'missing_abstract_count': 1,
+                'file_sha256': hashlib.sha256(path.read_bytes()).hexdigest()}))
+            ingest_file(db, path)
+            with sqlite3.connect(db) as c:
+                self.assertEqual(c.execute('SELECT status,raw_value,decision_date FROM decisions').fetchall(),
+                                 [('withdrawn', 'Withdrawn June 8, 2026', None)])
+                metadata = json.loads(c.execute('SELECT metadata_json FROM source_records').fetchone()[0])
+                self.assertEqual(metadata['withdrawal_date'], '2026-06-08')
+                self.assertEqual(metadata['decision_date_precision'], 'day')
+                self.assertEqual(c.execute('PRAGMA foreign_key_check').fetchall(), [])
+
     def test_retraction_is_not_accepted_or_withdrawn_and_retains_date(self):
         rows, _, held = self.parse()
         self.assertNotIn('2026/p238', {r['external_id'] for r in rows})