diff --git a/sfm/database.py b/sfm/database.py
index c1f596c..c0e8654 100644
--- a/sfm/database.py
+++ b/sfm/database.py
@@ -631,6 +631,26 @@ class SeismoDb:
             ).fetchall()
         return [dict(r) for r in rows]
 
+    def propagate_review_to_twins(self, event_id: str, *, window_seconds: int = 300) -> list[str]:
+        """
+        Copy this event's `false_trigger`/`reviewed_real` columns onto each
+        of its histogram/waveform twins (see `find_twins`), so flagging one
+        twin flags both.  Returns the list of twin ids updated.
+        """
+        row = self.get_event(event_id)
+        if not row:
+            return []
+        ft = 1 if row.get("false_trigger") else 0
+        real = 1 if row.get("reviewed_real") else 0
+        twins = self.find_twins(event_id, window_seconds=window_seconds)
+        moved = []
+        with self._connect() as conn:
+            for tw in twins:
+                conn.execute("UPDATE events SET false_trigger=?, reviewed_real=? WHERE id=?",
+                             (ft, real, tw["id"]))
+                moved.append(tw["id"])
+        return moved
+
     def set_false_trigger(self, event_id: str, value: bool) -> bool:
         """Set or clear the false_trigger flag on an event. Returns True if found."""
         with self._connect() as conn:
diff --git a/sfm/server.py b/sfm/server.py
index ea0c92a..6e2ea1a 100644
--- a/sfm/server.py
+++ b/sfm/server.py
@@ -2481,6 +2481,13 @@ def db_event_sidecar_patch(event_id: str, body: SidecarPatchBody) -> dict:
     if body.review is not None:
         _get_db().update_event_review(event_id, new_sidecar.get("review", {}))
 
+        # Propagate the review to the event's histogram/waveform twin(s) so
+        # flagging one flags both (column-level; twins share serial+PVS+near time).
+        try:
+            _get_db().propagate_review_to_twins(event_id)
+        except Exception as exc:
+            log.warning("twin review-propagation failed for %s: %s", event_id, exc)
+
     return new_sidecar
 
 
diff --git a/tests/test_twin_propagation.py b/tests/test_twin_propagation.py
new file mode 100644
index 0000000..c3f7386
--- /dev/null
+++ b/tests/test_twin_propagation.py
@@ -0,0 +1,33 @@
+import sqlite3
+from sfm.database import SeismoDb
+from minimateplus.models import Event, Timestamp
+
+
+def _ins(db, key, serial, pvs, ts):
+    ev = Event(index=0)
+    ev._waveform_key = bytes.fromhex(key)
+    ev.timestamp = ts
+    # peak_vector_sum comes from peak_values; simplest: insert then UPDATE pvs directly
+    db.insert_events([ev], serial=serial)
+    row = [r for r in db.query_events(serial=serial) if r["waveform_key"] == key][0]
+    with sqlite3.connect(db.db_path) as c:
+        c.execute("UPDATE events SET peak_vector_sum=? WHERE id=?", (pvs, row["id"]))
+    return row["id"]
+
+
+def test_propagate_copies_flags_to_twins(tmp_path):
+    db = SeismoDb(tmp_path / "s.db")
+    base = Timestamp(raw=b"", flag=0x10, year=2026, unknown_byte=0, month=2, day=25, hour=20, minute=19, second=5)
+    twin = Timestamp(raw=b"", flag=0x10, year=2026, unknown_byte=0, month=2, day=25, hour=20, minute=19, second=45)
+    other = Timestamp(raw=b"", flag=0x10, year=2026, unknown_byte=0, month=2, day=25, hour=20, minute=19, second=44)
+
+    primary_id = _ins(db, "01110001", "BE1", 0.4763, base)
+    twin_id = _ins(db, "01110002", "BE1", 0.4763, twin)        # twin: same serial+pvs, 40s apart
+    non_twin_id = _ins(db, "01110003", "BE1", 0.9999, other)   # near time but different pvs
+
+    db.update_event_review(primary_id, {"false_trigger": True})
+    moved = db.propagate_review_to_twins(primary_id)
+
+    assert twin_id in moved
+    assert db.get_event(twin_id)["false_trigger"] == 1
+    assert db.get_event(non_twin_id)["false_trigger"] == 0