diff --git a/chat/web/drawer.py b/chat/web/drawer.py
index 5396ae8..f0c3ddb 100644
--- a/chat/web/drawer.py
+++ b/chat/web/drawer.py
@@ -1278,7 +1278,19 @@ async def delete_turn(
 
     A snapshot is taken before truncation (inside ``execute_rewind``)
     so the user can recover via the snapshot index.
+
+    T110.1 guards ``event_id <= 0``: a stale tab or hand-crafted request
+    posting ``event_id=0`` would otherwise compute ``after_event_id=-1``
+    and silently truncate the entire log. ``id`` is auto-assigned by
+    SQLite starting at 1 so any caller's "real" id is always >= 1; a
+    zero or negative value can only mean a client bug, surfaced as 400.
     """
+    if int(event_id) <= 0:
+        raise HTTPException(
+            status_code=400,
+            detail=f"event_id must be a positive integer, got {event_id}",
+        )
+
     chat = get_chat(conn, chat_id)
     if chat is None:
         raise HTTPException(status_code=404, detail=f"chat not found: {chat_id}")
diff --git a/tests/test_drawer_phase4.py b/tests/test_drawer_phase4.py
index f94f266..f4f3235 100644
--- a/tests/test_drawer_phase4.py
+++ b/tests/test_drawer_phase4.py
@@ -458,6 +458,29 @@ def test_t98_4_delete_invokes_rewind_and_drops_cascade(client, tmp_path):
             assert row is None, f"event {ev_id} should have been deleted"
 
 
+def test_delete_turn_with_event_id_zero_returns_400(client, tmp_path):
+    """T110.1: ``event_id <= 0`` is an obvious client error and must NOT
+    silently rewind the entire log via ``after_event_id = -1``. The route
+    rejects it with 400 so the audit trail stays intact.
+    """
+    db = tmp_path / "test.db"
+    _seed_chat(db)
+    _seed_turns(db)
+
+    # Sanity: events present before the bad request.
+    with open_db(db) as conn:
+        before = conn.execute("SELECT COUNT(*) FROM event_log").fetchone()[0]
+        assert before > 0
+
+    response = client.post("/chats/chat_bot_a/drawer/turn/delete/0")
+    assert response.status_code == 400
+
+    # And the log was NOT truncated.
+    with open_db(db) as conn:
+        after = conn.execute("SELECT COUNT(*) FROM event_log").fetchone()[0]
+        assert after == before
+
+
 # ---------------------------------------------------------------------------
 # T98.5 — remaining v1 edits (chat narrative anchor + weather).
 # ---------------------------------------------------------------------------