diff --git a/backend/app/data/catalog.py b/backend/app/data/catalog.py
index c6e2c8fe..cace09c0 100644
--- a/backend/app/data/catalog.py
+++ b/backend/app/data/catalog.py
@@ -510,6 +510,30 @@ def _core(item: Mapping[str, Any]) -> dict[str, Any]:
     return {k: v for k, v in item.items() if k != "updated_at"}
 
 
+#: 数据剖析写的备注都以「数据剖析（日期）：」开头（data/catalog_profile.py 的 NOTE_PREFIX 就是它）
+PROFILE_NOTE_PREFIX = "数据剖析（"
+_PROFILE_NOTE_DAY = re.compile(r"^数据剖析（\d{4}-\d{2}-\d{2}）")
+
+
+def same_profile_note(a: Any, b: Any) -> bool:
+    """两段备注是否相同；数据剖析写的备注只有开头的日期不同，也算相同。
+
+    剖析每次都把当天的日期写进备注。隔天重跑、数据没变，结论一字不差、只有日期变了：要是这也算「变了」，目录就
+    升一个版本，发布时记下的目录版本对不上，之后每次正式运行都提醒「目录有变化」。
+    """
+    if a == b:
+        return True
+    if not (isinstance(a, str) and isinstance(b, str) and _PROFILE_NOTE_DAY.match(a) and _PROFILE_NOTE_DAY.match(b)):
+        return False
+    return _PROFILE_NOTE_DAY.sub("", a, count=1) == _PROFILE_NOTE_DAY.sub("", b, count=1)
+
+
+def _same_core(a: Mapping[str, Any], b: Mapping[str, Any]) -> bool:
+    """两项除修改时间外相同（剖析备注里的日期不算，same_profile_note）。"""
+    ca, cb = _core(a), _core(b)
+    return same_profile_note(ca.pop("note", None), cb.pop("note", None)) and ca == cb
+
+
 def visible_notes(notes: Mapping[str, Any] | None) -> dict[str, Any]:
     """去掉被驳回的项和关系。给模型看、冻结进证据、将来的检查都只用这一份。"""
     return _assemble({k: v for k, v in _slots(notes).items() if v.get("status") != "rejected"})
@@ -554,7 +578,7 @@ def merge_notes(existing: Mapping[str, Any] | None, draft: Mapping[str, Any] | N
     - 已有项是 confirmed 或 rejected：不动。驳回的留着，同一项下次起草就不会再冒出来。
     - 起草结果里没有这一项：已有项的来源在 covered 里（这一轮完整算过这个来源）就删掉，否则留着。
       外键约束被删掉以后，原来那条「有确证」的关系不能还挂着；而这一轮没调模型，就不能因此删掉模型起草的项。
-    - 同一来源：值或状态有变化就更新。
+    - 同一来源：值或状态有变化就更新。数据剖析写的备注只是日期变了不算变化（same_profile_note），保留旧的项。
     - 不同来源：来源更可信的（_SOURCE_RANK）顶掉不如它的，反过来不行。
 
     新增和更新的项盖上 at（缺省为当前时间）作为 updated_at；内容没变的项保持原样，修改时间也不动。
@@ -575,7 +599,7 @@ def merge_notes(existing: Mapping[str, Any] | None, draft: Mapping[str, Any] | N
                 out[key] = item
         elif (cand.get("source") == item.get("source")
               or _SOURCE_RANK.get(cand.get("source"), 0) > _SOURCE_RANK.get(item.get("source"), 0)):
-            if _core(cand) != _core(item):
+            if not _same_core(cand, item):
                 out[key] = {**_core(cand), "updated_at": at}
                 updated += 1
             else:
@@ -2107,7 +2131,8 @@ __all__ = [
     "CATALOG_DRAFT_SYSTEM", "COLUMN_FIELDS", "COLUMN_FIELD_LABEL", "COLUMN_MEASURES", "CatalogConflict",
     "CatalogEntry", "CatalogInvalid", "CatalogModelUnavailable", "CatalogPathError", "DRAFT_DEFAULT_TABLES",
     "DraftReport", "INFERRED_MARK", "ITEM_SOURCES", "ITEM_STATUSES", "JoinEdge", "KIND_LABEL", "MEASURE_LABEL",
-    "MergeStats", "NEW_RELATION_PATH", "PATCH_MAX_CHANGES", "PROFILE_VERIFY_COVERAGE", "PatchChange", "PatchPlan",
+    "MergeStats", "NEW_RELATION_PATH", "PATCH_MAX_CHANGES", "PROFILE_NOTE_PREFIX", "PROFILE_VERIFY_COVERAGE",
+    "PatchChange", "PatchPlan",
     "QUERY_SNAPSHOT_KIND", "REVIEW_ACTIONS", "TABLE_FIELDS", "TABLE_FIELD_LABEL", "TABLE_KINDS", "TableDraft",
     "TableDraftResult", "UI_KIND_LABEL", "UI_MEASURE_LABEL", "apply_human_edit", "apply_patch", "codes_complete",
     "describe_slot",
diff --git a/backend/app/data/catalog_profile.py b/backend/app/data/catalog_profile.py
index 7b194268..d76e3ea1 100644
--- a/backend/app/data/catalog_profile.py
+++ b/backend/app/data/catalog_profile.py
@@ -443,8 +443,9 @@ async def estimate_size(run: _Runner, dialect: SqlDialect, meta: dict[str, Any],
 PROFILE_DEFAULT_TABLES = 10
 #: IN 列表每批最多几个值：Oracle 的 IN 列表不能超过 1000 项（ORA-01795），各家统一按它分批
 IN_CHUNK = 1000
-#: 剖析写的备注都以它开头：人工确认过的关系，只覆盖剖析自己写的备注，不碰人写的
-NOTE_PREFIX = "数据剖析（"
+#: 剖析写的备注都以它开头：人工确认过的关系，只覆盖剖析自己写的备注，不碰人写的。开头接着剖析的日期，
+#: 比较「结论变没变」时日期不算（catalog.same_profile_note）
+NOTE_PREFIX = catalog.PROFILE_NOTE_PREFIX
 #: 整次剖析停下的原因 → 剩下没查的项的说明
 _STOP_DETAIL = {
     "budget": "本次剖析的查询次数已用完（上限 {max_queries} 条），未检查",
@@ -958,7 +959,7 @@ def _codes_finding(c: _CodesOutcome, value: dict[str, str]) -> dict[str, Any]:
 
 def _patch_confirmed(rel: dict[str, Any], o: _RelationOutcome, at: str) -> bool:
     """人工确认过的关系只补覆盖率和基数：覆盖率是测量值，照新的写；基数只在原来没有时补，不改人定的；
-    备注只在原来为空、或者是剖析自己写的时候换成新的。状态、来源不动。返回改没改。"""
+    备注只在原来为空、或者是剖析自己写的时候换成新的（只是日期变了不换）。状态、来源不动。返回改没改。"""
     changed = False
     if rel.get("coverage") != o.coverage:
         rel["coverage"] = o.coverage
@@ -967,7 +968,7 @@ def _patch_confirmed(rel: dict[str, Any], o: _RelationOutcome, at: str) -> bool:
         rel["cardinality"] = o.cardinality
         changed = True
     note = rel.get("note")
-    if (not note or str(note).startswith(NOTE_PREFIX)) and note != o.note:
+    if (not note or str(note).startswith(NOTE_PREFIX)) and not catalog.same_profile_note(note, o.note):
         rel["note"] = o.note
         changed = True
     if changed:
diff --git a/backend/tests/test_catalog_semantics.py b/backend/tests/test_catalog_semantics.py
index 1f2fa07d..cf0b38d6 100644
--- a/backend/tests/test_catalog_semantics.py
+++ b/backend/tests/test_catalog_semantics.py
@@ -342,3 +342,55 @@ async def test_profile_marks_codes_complete_only_when_the_whole_table_was_read(c
     assert "按前 10 行统计" in codes["note"] and "complete" not in codes
 
 
+# ==========================================================================
+# B2：隔天重新剖析、数据没变，不升版本
+# ==========================================================================
+
+
+async def test_rerun_on_another_day_with_same_data_keeps_the_version(client, make_source, tmp_path, monkeypatch):
+    path = scenic.build(tmp_path / "b2.db")
+    sid = await make_source(path, options=_on(), draft=["visits"])
+    # 人工确认过的关系：剖析只补覆盖率和基数、换自己的备注，同样不能因为日期变了就改
+    detail = await _notes(client, sid, "visits")
+    gate = _relation(detail["notes"], "gate_id")
+    r = await client.post(f"/api/datasources/{sid}/catalog/visits/review",
+                          json={"path": f"relations.{gate['id']}", "action": "confirm", "if_version": detail["version"]})
+    assert r.status_code == 200, r.text
+
+    monkeypatch.setattr(catalog, "now_iso", lambda: DAY1)
+    first = _table((await client.post(_url(sid), json={"tables": ["visits"]})).json(), "visits")
+    notes_day1 = (await _notes(client, sid, "visits"))["notes"]
+    monkeypatch.setattr(catalog, "now_iso", lambda: DAY2)
+    second = _table((await client.post(_url(sid), json={"tables": ["visits"]})).json(), "visits")
+    assert (second["added"], second["updated"], second["removed"]) == (0, 0, 0)
+    assert second["version"] == first["version"]
+    assert (await _notes(client, sid, "visits"))["notes"] == notes_day1        # 备注里还是第一天的日期
+
+    # 数据变了（多了一种状态），结论跟着变：照常升版本
+    db = sqlite3.connect(path)
+    try:
+        db.execute("INSERT INTO visits VALUES (1501, 'TK9001501', 1, 1, 1, NULL, '2026-09-30 10:00:00', 1, 2)")
+        db.commit()
+    finally:
+        db.close()
+    monkeypatch.setattr(catalog, "now_iso", lambda: DAY3)
+    third = _table((await client.post(_url(sid), json={"tables": ["visits"]})).json(), "visits")
+    assert third["version"] == second["version"] + 1 and third["updated"] >= 1
+    codes = (await _notes(client, sid, "visits"))["notes"]["columns"]["status"]["codes"]
+    assert set(codes["value"]) == {"0", "1", "2"} and "2026-10-03" in codes["note"]
+
+
+def test_merge_ignores_a_profile_note_that_only_changed_its_date():
+    old = {"columns": {"status": {"codes": catalog.make_item(
+        {"1": "", "0": ""}, "profile", "proposed", note="数据剖析（2026-10-01）：统计全表，1500 行非空值共 2 个取值。",
+        at=DAY1)}}}
+    same = {"columns": {"status": {"codes": catalog.make_item(
+        {"1": "", "0": ""}, "profile", "proposed", note="数据剖析（2026-10-02）：统计全表，1500 行非空值共 2 个取值。")}}}
+    merged, stats = catalog.merge_notes(old, same, covered={"profile"}, at=DAY2)
+    assert merged == old and stats == catalog.MergeStats()
+    changed = {"columns": {"status": {"codes": catalog.make_item(
+        {"1": "", "0": ""}, "profile", "proposed", note="数据剖析（2026-10-02）：统计全表，1600 行非空值共 2 个取值。")}}}
+    merged, stats = catalog.merge_notes(old, changed, covered={"profile"}, at=DAY2)
+    assert stats.updated == 1 and "2026-10-02" in merged["columns"]["status"]["codes"]["note"]
+
+