diff --git a/tests/tui_gateway/test_completed_turn_committed_ids.py b/tests/tui_gateway/test_completed_turn_committed_ids.py
deleted file mode 100644
index e474749650e7d..0000000000000
--- a/tests/tui_gateway/test_completed_turn_committed_ids.py
+++ /dev/null
@@ -1,82 +0,0 @@
-"""Tests for `_completed_turn_committed_ids` (tui_gateway/server.py).
-
-The desktop renders a sent turn optimistically and stamps its client-minted
-row ids to the real committed ids carried on the ``message.complete`` frame.
-If that frame omits the ids, the live session-sync poll re-appends every
-committed row as a DUPLICATE (each message shown twice, DB clean). This helper
-is the server half of the fix: it extracts ``[user_id, assistant_id]`` for the
-just-finished turn from ``session["history"]``, keyed off the
-``_db_persisted_row_id`` stamped during DB flush.
-"""
-
-from __future__ import annotations
-
-import tui_gateway.server as srv
-
-
-def test_returns_user_then_assistant_committed_ids_in_order():
-    history = [
-        {"role": "user", "content": "hi", "_db_persisted_row_id": 100},
-        {"role": "assistant", "content": "hello", "_db_persisted_row_id": 101},
-    ]
-    assert srv._completed_turn_committed_ids(history) == [100, 101]
-
-
-def test_returns_last_user_and_last_assistant_text_across_a_tool_loop():
-    # A tool-loop turn: user, assistant(tool_calls), tool result, final
-    # assistant text. The client only holds two optimistic rows (the user
-    # message and the FINAL assistant text bubble); tool rows arrive via the
-    # poll with their own ids. So the frame must carry exactly the user id and
-    # the final assistant *text* id.
-    history = [
-        {"role": "user", "content": "do a thing", "_db_persisted_row_id": 200},
-        {
-            "role": "assistant",
-            "content": "",
-            "tool_calls": [{"id": "t1", "function": {"name": "x", "arguments": "{}"}}],
-            "_db_persisted_row_id": 201,
-        },
-        {"role": "tool", "tool_call_id": "t1", "content": "result", "_db_persisted_row_id": 202},
-        {"role": "assistant", "content": "done", "_db_persisted_row_id": 203},
-    ]
-    assert srv._completed_turn_committed_ids(history) == [200, 203]
-
-
-def test_skips_assistant_tool_calls_row_with_no_text():
-    # An assistant(tool_calls) row with empty content is NOT an optimistic
-    # client text bubble — it must never be returned as the assistant id.
-    history = [
-        {"role": "user", "content": "go", "_db_persisted_row_id": 10},
-        {
-            "role": "assistant",
-            "content": "   ",
-            "tool_calls": [{"id": "t", "function": {"name": "y", "arguments": "{}"}}],
-            "_db_persisted_row_id": 11,
-        },
-    ]
-    # Only the user id is a real optimistic row; no final assistant text yet.
-    assert srv._completed_turn_committed_ids(history) == [10]
-
-
-def test_missing_row_ids_are_skipped():
-    # Best-effort: a message without a committed row id (not yet flushed, or a
-    # mock) is skipped rather than emitting a bogus/None id.
-    history = [
-        {"role": "user", "content": "hi"},  # no _db_persisted_row_id
-        {"role": "assistant", "content": "hello", "_db_persisted_row_id": 101},
-    ]
-    assert srv._completed_turn_committed_ids(history) == [101]
-
-
-def test_non_int_row_id_is_ignored():
-    history = [
-        {"role": "user", "content": "hi", "_db_persisted_row_id": "100"},
-        {"role": "assistant", "content": "hello", "_db_persisted_row_id": 101},
-    ]
-    assert srv._completed_turn_committed_ids(history) == [101]
-
-
-def test_empty_or_invalid_history_returns_empty():
-    assert srv._completed_turn_committed_ids([]) == []
-    assert srv._completed_turn_committed_ids(None) == []  # type: ignore[arg-type]
-    assert srv._completed_turn_committed_ids(["garbage", 42, None]) == []  # type: ignore[list-item]