From 8759b5860db87441364a78063b054e10b7ef952e Mon Sep 17 00:00:00 2001
From: npeter83 <npeter83+claude@gmail.com>
Date: Sat, 19 Sep 2026 17:26:07 +0200
Subject: [PATCH] test(be): every dependency override goes through override_dep

22 test files set `app.dependency_overrides[...]` by hand and tore down with a blanket `.clear()`
in a `finally`, which wipes every override rather than the test's own and stops fixtures composing.
They now take the `override_dep` fixture (helpers get it passed in), whose teardown restores each
key's prior value; no clear() carried meaning between two phases of a test. A convention test fails
any test file that writes `dependency_overrides` directly.
---
 backend/tests/test_channel_backfill.py        |  52 ++----
 backend/tests/test_channel_tags.py            |  13 +-
 backend/tests/test_feed_cursor.py             |  21 +--
 backend/tests/test_hls_reaper.py              |  28 ++-
 backend/tests/test_override_dep_convention.py |  23 +++
 backend/tests/test_plex_clear_resume_push.py  |  25 ++-
 backend/tests/test_plex_collection_sort.py    |  47 +++--
 backend/tests/test_plex_collections_filter.py | 171 ++++++++----------
 backend/tests/test_plex_detail.py             |  31 ++--
 backend/tests/test_plex_discover.py           |  79 ++++----
 backend/tests/test_plex_facets.py             |  24 +--
 .../tests/test_plex_field_scoped_search.py    |  65 ++++---
 backend/tests/test_plex_hls_file_route.py     |   9 +-
 backend/tests/test_plex_keyword_filter.py     |  25 ++-
 backend/tests/test_plex_lang.py               |  49 ++---
 backend/tests/test_plex_last_watched_sort.py  |  35 ++--
 backend/tests/test_plex_person.py             |  19 +-
 backend/tests/test_plex_person_bio.py         |  23 +--
 backend/tests/test_plex_playback_class.py     |  89 ++++-----
 backend/tests/test_plex_playback_session.py   |  23 +--
 backend/tests/test_plex_query_conversion.py   | 121 ++++++++-----
 backend/tests/test_saved_views_source.py      |  83 ++++-----
 backend/tests/test_search_scrape_ingest.py    |  11 +-
 23 files changed, 537 insertions(+), 529 deletions(-)
 create mode 100644 backend/tests/test_override_dep_convention.py

diff --git a/backend/tests/test_channel_backfill.py b/backend/tests/test_channel_backfill.py
index d1244641..5520a3a1 100644
--- a/backend/tests/test_channel_backfill.py
+++ b/backend/tests/test_channel_backfill.py
@@ -18,7 +18,7 @@ from app.sync import runner, videos
 _PUB = datetime(2020, 1, 1, tzinfo=timezone.utc)
 
 
-def test_channel_detail_returns_normal_shorts_live_counts(db, monkeypatch):
+def test_channel_detail_returns_normal_shorts_live_counts(db, monkeypatch, override_dep):
     # published_at set so channel_detail skips the YouTube-enrich path (no quota / network in tests).
     ch = Channel(id="UC_nsl", title="N/S/L Channel", published_at=_PUB)
     db.add(ch)
@@ -40,12 +40,9 @@ def test_channel_detail_returns_normal_shorts_live_counts(db, monkeypatch):
 
     # The request gate 503s an unconfigured instance; flip the process-level flag (auto-restored).
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: me
-    try:
-        resp = TestClient(app).get(f"/api/channels/{ch.id}")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: me)
+    resp = TestClient(app).get(f"/api/channels/{ch.id}")
 
     assert resp.status_code == 200, resp.text
     body = resp.json()
@@ -56,7 +53,7 @@ def test_channel_detail_returns_normal_shorts_live_counts(db, monkeypatch):
 
 
 @pytest.mark.parametrize("hidden", [True, False])
-def test_channel_detail_surfaces_subscription_hidden_flag(db, monkeypatch, hidden):
+def test_channel_detail_surfaces_subscription_hidden_flag(db, monkeypatch, hidden, override_dep):
     # S6: the detail GET must expose the per-subscription `hidden` flag so the channel page can offer
     # the same Unhide toggle the manager has (the flag was previously omitted from the detail dict).
     ch = Channel(id="UC_hid", title="Hidden?", published_at=_PUB)
@@ -68,18 +65,15 @@ def test_channel_detail_surfaces_subscription_hidden_flag(db, monkeypatch, hidde
     db.commit()
 
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: me
-    try:
-        resp = TestClient(app).get(f"/api/channels/{ch.id}")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: me)
+    resp = TestClient(app).get(f"/api/channels/{ch.id}")
 
     assert resp.status_code == 200, resp.text
     assert resp.json()["hidden"] is hidden
 
 
-def test_channel_detail_hidden_defaults_false_when_not_subscribed(db, monkeypatch):
+def test_channel_detail_hidden_defaults_false_when_not_subscribed(db, monkeypatch, override_dep):
     # No subscription row → the flag can't be True; it must serialize as False, not raise.
     ch = Channel(id="UC_hid_ns", title="Unsub", published_at=_PUB)
     me = User(email="hidns@example.com")
@@ -87,12 +81,9 @@ def test_channel_detail_hidden_defaults_false_when_not_subscribed(db, monkeypatc
     db.commit()
 
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: me
-    try:
-        resp = TestClient(app).get(f"/api/channels/{ch.id}")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: me)
+    resp = TestClient(app).get(f"/api/channels/{ch.id}")
 
     assert resp.status_code == 200, resp.text
     assert resp.json()["hidden"] is False
@@ -115,33 +106,30 @@ def _setup_channel_and_sub(db, *, email, is_demo=False):
     return ch, user
 
 
-def _patch_deep_requested(db, monkeypatch, user):
+def _patch_deep_requested(db, monkeypatch, override_dep, user):
     calls: list[tuple] = []
     # background.add_task runs after the response in TestClient; record what would be scheduled.
     monkeypatch.setattr(channels_route, "backfill_channel_now", lambda *a, **k: calls.append(a))
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        resp = TestClient(app).patch("/api/channels/UC_wire", json={"deep_requested": True})
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    resp = TestClient(app).patch("/api/channels/UC_wire", json={"deep_requested": True})
     return resp, calls
 
 
-def test_deep_request_schedules_immediate_backfill_for_non_demo(db, monkeypatch):
+def test_deep_request_schedules_immediate_backfill_for_non_demo(db, monkeypatch, override_dep):
     ch, me = _setup_channel_and_sub(db, email="wire@example.com")
-    resp, calls = _patch_deep_requested(db, monkeypatch, me)
+    resp, calls = _patch_deep_requested(db, monkeypatch, override_dep, me)
     assert resp.status_code == 200, resp.text
     assert resp.json()["deep_requested"] is True
     # scheduled exactly once, with (channel_id, user_id) — the args backfill_channel_now needs.
     assert calls == [(ch.id, me.id)]
 
 
-def test_deep_request_does_not_schedule_immediate_backfill_for_demo(db, monkeypatch):
+def test_deep_request_does_not_schedule_immediate_backfill_for_demo(db, monkeypatch, override_dep):
     # The SHARED demo account must not be able to kick immediate full backfills (budget drain).
     _ch, demo = _setup_channel_and_sub(db, email="demo@example.com", is_demo=True)
-    resp, calls = _patch_deep_requested(db, monkeypatch, demo)
+    resp, calls = _patch_deep_requested(db, monkeypatch, override_dep, demo)
     assert resp.status_code == 200, resp.text
     assert calls == [], "demo must not schedule an immediate backfill"
     # …and deep_requested is not persisted on the shared demo subscription either.
diff --git a/backend/tests/test_channel_tags.py b/backend/tests/test_channel_tags.py
index de7e9643..49bad533 100644
--- a/backend/tests/test_channel_tags.py
+++ b/backend/tests/test_channel_tags.py
@@ -17,7 +17,7 @@ from app.main import app
 from app.models import Channel, ChannelTag, Tag, User
 
 
-def test_channel_detail_returns_only_this_users_tag_ids(db, monkeypatch):
+def test_channel_detail_returns_only_this_users_tag_ids(db, monkeypatch, override_dep):
     # published_at set so channel_detail skips the YouTube-enrich path (no quota / network in tests).
     ch = Channel(
         id="UC_tags_test",
@@ -43,13 +43,10 @@ def test_channel_detail_returns_only_this_users_tag_ids(db, monkeypatch):
 
     # The request gate 503s an unconfigured instance; flip the process-level flag (auto-restored).
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: me
-    try:
-        client = TestClient(app)  # no context-manager: skip lifespan (scheduler/HLS sweep)
-        resp = client.get(f"/api/channels/{ch.id}")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: me)
+    client = TestClient(app)  # no context-manager: skip lifespan (scheduler/HLS sweep)
+    resp = client.get(f"/api/channels/{ch.id}")
 
     assert resp.status_code == 200, resp.text
     assert resp.json()["tag_ids"] == [mine.id]
diff --git a/backend/tests/test_feed_cursor.py b/backend/tests/test_feed_cursor.py
index f90c470f..0c1fcd5a 100644
--- a/backend/tests/test_feed_cursor.py
+++ b/backend/tests/test_feed_cursor.py
@@ -15,34 +15,31 @@ from app.main import app
 from app.models import User
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(
         state, "_configured_cache", True
     )  # the request gate 503s an unconfigured app
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        client = TestClient(app)  # no context manager: skip lifespan (scheduler/HLS sweep)
-        return client.get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    client = TestClient(app)  # no context manager: skip lifespan (scheduler/HLS sweep)
+    return client.get(path)
 
 
-def test_malformed_feed_cursor_returns_400(db, monkeypatch):
+def test_malformed_feed_cursor_returns_400(db, monkeypatch, override_dep):
     user = User(email="feedcursor@example.com")
     db.add(user)
     db.commit()
-    resp = _get(db, user, monkeypatch, "/api/feed?cursor=not-a-real-cursor")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/feed?cursor=not-a-real-cursor")
     assert resp.status_code == 400
     assert resp.json()["detail"] == {"code": "refused", "reason": "invalid_cursor"}
 
 
-def test_feed_without_cursor_is_200(db, monkeypatch):
+def test_feed_without_cursor_is_200(db, monkeypatch, override_dep):
     # Sanity: the same endpoint without a cursor is a normal 200 (proves the 400 above is the
     # cursor path, not a globally-broken request). A fresh user has no subscriptions → empty feed.
     user = User(email="feednocursor@example.com")
     db.add(user)
     db.commit()
-    resp = _get(db, user, monkeypatch, "/api/feed")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/feed")
     assert resp.status_code == 200
     assert resp.json()["items"] == []
diff --git a/backend/tests/test_hls_reaper.py b/backend/tests/test_hls_reaper.py
index b42b2ee4..81a396f5 100644
--- a/backend/tests/test_hls_reaper.py
+++ b/backend/tests/test_hls_reaper.py
@@ -142,13 +142,15 @@ def _library_item(db, rating_key: str, *, playable: str = "remux"):
     return it
 
 
-def _client(db, user):
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
+def _client(db, user, override_dep):
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
     return TestClient(app)
 
 
-def test_a_paused_viewers_checkpoint_keeps_their_session_alive(db, monkeypatch, tmp_path, sessions):
+def test_a_paused_viewers_checkpoint_keeps_their_session_alive(
+    db, monkeypatch, tmp_path, sessions, override_dep
+):
     """The whole reason the short rule is safe again: a paused player fetches nothing, so
     `last_access` never moved on its own — but it does keep checkpointing its position."""
     monkeypatch.setattr(state, "_configured_cache", True)
@@ -158,20 +160,17 @@ def test_a_paused_viewers_checkpoint_keeps_their_session_alive(db, monkeypatch,
     db.commit()
     s = _Session(tmp_path, "paused", finished=True, idle_s=90)
     sessions[(user.id, "paused1")] = s
-    try:
-        resp = _client(db, user).post(
-            f"/api/plex/item/{it.rating_key}/progress",
-            json={"position_seconds": 600, "duration_seconds": 3000, "final": False},
-        )
-    finally:
-        app.dependency_overrides.clear()
+    resp = _client(db, user, override_dep).post(
+        f"/api/plex/item/{it.rating_key}/progress",
+        json={"position_seconds": 600, "duration_seconds": 3000, "final": False},
+    )
     assert resp.status_code == 200, resp.text
     assert stream.reap_idle() == 0, "the checkpoint did not say the viewer is still there"
     assert (user.id, "paused1") in sessions and not s.proc.killed
 
 
 def test_starting_a_session_leaves_another_viewers_paused_one_alone(
-    db, monkeypatch, tmp_path, sessions
+    db, monkeypatch, tmp_path, sessions, override_dep
 ):
     """The opportunistic sweep this route used to run was not scoped to the key being started: it
     walked the WHOLE registry with the 30 s finished rule, so pressing play on any item killed a
@@ -196,9 +195,6 @@ def test_starting_a_session_leaves_another_viewers_paused_one_alone(
         )
 
     monkeypatch.setattr(stream, "start_session", fake_start)
-    try:
-        resp = _client(db, user).post(f"/api/plex/stream/{started.rating_key}/session")
-    finally:
-        app.dependency_overrides.clear()
+    resp = _client(db, user, override_dep).post(f"/api/plex/stream/{started.rating_key}/session")
     assert resp.status_code == 200, resp.text
     assert (999, "someone-else") in sessions and not paused.proc.killed
diff --git a/backend/tests/test_override_dep_convention.py b/backend/tests/test_override_dep_convention.py
new file mode 100644
index 00000000..d631bfd0
--- /dev/null
+++ b/backend/tests/test_override_dep_convention.py
@@ -0,0 +1,23 @@
+"""Dependency overrides go through `conftest.override_dep`, never `app.dependency_overrides` directly.
+
+The hand-rolled shape — assign, then `app.dependency_overrides.clear()` in a `finally` — wipes EVERY
+override, not the ones the test set, so it stops fixtures composing: one test's teardown silently
+clobbers an override another fixture installed. `override_dep` restores each key's prior value
+instead. 22 files had drifted to the hand-rolled shape (it was the house norm at ~20 files to 3), and
+the sweep that converted them is only as good as the check that keeps it converted — this one.
+"""
+
+from pathlib import Path
+
+TESTS = Path(__file__).parent
+
+
+def test_no_test_writes_dependency_overrides_directly():
+    offenders = [
+        f"{p.name}:{n}"
+        for p in sorted(TESTS.rglob("*.py"))
+        if p.name not in {"conftest.py", Path(__file__).name}
+        for n, line in enumerate(p.read_text(encoding="utf-8").splitlines(), 1)
+        if "dependency_overrides" in line
+    ]
+    assert offenders == [], "use the override_dep fixture: " + ", ".join(offenders)
diff --git a/backend/tests/test_plex_clear_resume_push.py b/backend/tests/test_plex_clear_resume_push.py
index b088a84d..c594bb87 100644
--- a/backend/tests/test_plex_clear_resume_push.py
+++ b/backend/tests/test_plex_clear_resume_push.py
@@ -42,7 +42,7 @@ def _seed(db, *, status: str, position: int):
     return it, user
 
 
-def _clear(db, user, it, monkeypatch) -> list[tuple]:
+def _clear(db, user, it, monkeypatch, override_dep) -> list[tuple]:
     """Drive the endpoint with the Plex link satisfied and the background push recorded."""
     pushes: list[tuple] = []
     monkeypatch.setattr(state, "_configured_cache", True)  # pass the instance-setup request gate
@@ -52,32 +52,29 @@ def _clear(db, user, it, monkeypatch) -> list[tuple]:
         "push_state_to_plex",
         lambda user_id, item_id, rating_key, action, *rest: pushes.append((rating_key, action)),
     )
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        resp = TestClient(app).post(f"/api/plex/item/{it.rating_key}/state", json={"status": "new"})
-        assert resp.status_code == 200, resp.text
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    resp = TestClient(app).post(f"/api/plex/item/{it.rating_key}/state", json={"status": "new"})
+    assert resp.status_code == 200, resp.text
     return pushes
 
 
-def test_clearing_an_in_progress_item_tells_plex(db, monkeypatch):
+def test_clearing_an_in_progress_item_tells_plex(db, monkeypatch, override_dep):
     # The regression: status "new" + a position IS the in-progress shape, and it must push.
     it, user = _seed(db, status="new", position=92)
-    assert _clear(db, user, it, monkeypatch) == [("98614", "unwatched")]
+    assert _clear(db, user, it, monkeypatch, override_dep) == [("98614", "unwatched")]
     assert db.query(PlexState).count() == 0
 
 
-def test_clearing_a_watched_item_still_tells_plex(db, monkeypatch):
+def test_clearing_a_watched_item_still_tells_plex(db, monkeypatch, override_dep):
     # The case the old guard did cover — kept, so the fix cannot narrow into a new hole.
     it, user = _seed(db, status="watched", position=0)
-    assert _clear(db, user, it, monkeypatch) == [("98614", "unwatched")]
+    assert _clear(db, user, it, monkeypatch, override_dep) == [("98614", "unwatched")]
 
 
-def test_unhiding_touches_plex_not_at_all(db, monkeypatch):
+def test_unhiding_touches_plex_not_at_all(db, monkeypatch, override_dep):
     # `hidden` is a Siftlode-only concept "with no Plex analogue, so it never touches Plex" — the
     # endpoint's own docstring. The old status-only guard pushed here anyway, un-marking an item on
     # Plex that the user had merely hidden.
     it, user = _seed(db, status="hidden", position=0)
-    assert _clear(db, user, it, monkeypatch) == []
+    assert _clear(db, user, it, monkeypatch, override_dep) == []
diff --git a/backend/tests/test_plex_collection_sort.py b/backend/tests/test_plex_collection_sort.py
index 431e69f0..255d66a3 100644
--- a/backend/tests/test_plex_collection_sort.py
+++ b/backend/tests/test_plex_collection_sort.py
@@ -231,61 +231,70 @@ def _seed(db):
     return user
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)
 
 
 def _order(r) -> list[str]:
     return [i["title"] for i in r.json()["items"]]
 
 
-def test_collection_detail_defaults_to_release_year_ascending(db, monkeypatch):
+def test_collection_detail_defaults_to_release_year_ascending(db, monkeypatch, override_dep):
     """The order the page had before it grew a control — a franchise reads in release order."""
     user = _seed(db)
-    r = _get(db, user, monkeypatch, "/api/plex/collections/col1")
+    r = _get(db, user, monkeypatch, override_dep, "/api/plex/collections/col1")
     assert r.status_code == 200
     assert _order(r) == ["Zulu", "Mike", "Series", "Alpha"]
 
 
-def test_collection_detail_honours_sort_and_direction(db, monkeypatch):
+def test_collection_detail_honours_sort_and_direction(db, monkeypatch, override_dep):
     user = _seed(db)
-    r = _get(db, user, monkeypatch, "/api/plex/collections/col1?sort=year&sort_dir=desc")
+    r = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/collections/col1?sort=year&sort_dir=desc"
+    )
     assert _order(r) == ["Alpha", "Series", "Mike", "Zulu"]
-    r = _get(db, user, monkeypatch, "/api/plex/collections/col1?sort=title&sort_dir=asc")
+    r = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/collections/col1?sort=title&sort_dir=asc"
+    )
     assert _order(r) == ["Alpha", "Mike", "Series", "Zulu"]
-    r = _get(db, user, monkeypatch, "/api/plex/collections/col1?sort=rating&sort_dir=desc")
+    r = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/collections/col1?sort=rating&sort_dir=desc"
+    )
     # The show has no rating, so it sinks — it is not "rated 0".
     assert _order(r) == ["Zulu", "Mike", "Alpha", "Series"]
 
 
-def test_lastwatched_ranks_a_shows_episodes_alongside_the_movies(db, monkeypatch):
+def test_lastwatched_ranks_a_shows_episodes_alongside_the_movies(db, monkeypatch, override_dep):
     """The show leg needs the rollup's `resumed_at`; with only a status map this key would order
     every show as never-watched."""
     user = _seed(db)
-    r = _get(db, user, monkeypatch, "/api/plex/collections/col1?sort=lastwatched&sort_dir=desc")
+    r = _get(
+        db,
+        user,
+        monkeypatch,
+        override_dep,
+        "/api/plex/collections/col1?sort=lastwatched&sort_dir=desc",
+    )
     # Series (episode resumed NOW) > Zulu (watched 2 days ago) > the two never-touched, title-asc.
     assert _order(r) == ["Series", "Zulu", "Alpha", "Mike"]
 
 
-def test_collections_list_resolves_titles_by_key(db, monkeypatch):
+def test_collections_list_resolves_titles_by_key(db, monkeypatch, override_dep):
     """What a shared Plex link needs: the URL carries bare rating_keys, so the sidebar token and the
     filter chip have nothing to show but `17045` until these are resolved."""
     user = _seed(db)
-    r = _get(db, user, monkeypatch, "/api/plex/collections?keys=col1")
+    r = _get(db, user, monkeypatch, override_dep, "/api/plex/collections?keys=col1")
     assert r.status_code == 200
     assert [c["title"] for c in r.json()["collections"]] == ["Franchise"]
 
 
-def test_an_empty_keys_param_asks_for_nothing(db, monkeypatch):
+def test_an_empty_keys_param_asks_for_nothing(db, monkeypatch, override_dep):
     """`keys=` with nothing in it must not fall through to "every collection" — that would be a
     200 KB answer to a question about zero ids."""
     user = _seed(db)
-    r = _get(db, user, monkeypatch, "/api/plex/collections?keys=")
+    r = _get(db, user, monkeypatch, override_dep, "/api/plex/collections?keys=")
     assert r.status_code == 200
     assert r.json()["collections"] == []
diff --git a/backend/tests/test_plex_collections_filter.py b/backend/tests/test_plex_collections_filter.py
index f8b49bbd..dbfb04b9 100644
--- a/backend/tests/test_plex_collections_filter.py
+++ b/backend/tests/test_plex_collections_filter.py
@@ -58,44 +58,44 @@ def _seed(db):
     return user
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)
 
 
 def _titles(resp):
     return {i["title"] for i in resp.json()["items"]}
 
 
-def test_single_collection_filters_to_its_members(db, monkeypatch):
+def test_single_collection_filters_to_its_members(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&collections=A")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&collections=A")
     assert _titles(resp) == {"Only A", "A and B"}
 
 
-def test_multiple_collections_any_is_the_union(db, monkeypatch):
+def test_multiple_collections_any_is_the_union(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&collections=A,B")
+    resp = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&collections=A,B"
+    )
     assert _titles(resp) == {"Only A", "Only B", "A and B"}
 
 
-def test_multiple_collections_all_is_the_intersection(db, monkeypatch):
+def test_multiple_collections_all_is_the_intersection(db, monkeypatch, override_dep):
     user = _seed(db)
     resp = _get(
         db,
         user,
         monkeypatch,
+        override_dep,
         "/api/plex/library?scope=movie&collections=A,B&collection_mode=all",
     )
     assert _titles(resp) == {"A and B"}
 
 
-def test_collection_cards_carry_montage_art_and_total_runtime(db, monkeypatch):
+def test_collection_cards_carry_montage_art_and_total_runtime(db, monkeypatch, override_dep):
     # The browse-tile montage (top films, best-rated first) + the collection's total runtime.
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
     db.add(lib)
@@ -127,14 +127,16 @@ def test_collection_cards_carry_montage_art_and_total_runtime(db, monkeypatch):
     db.commit()
     card = next(
         c
-        for c in _get(db, user, monkeypatch, "/api/plex/collections").json()["collections"]
+        for c in _get(db, user, monkeypatch, override_dep, "/api/plex/collections").json()[
+            "collections"
+        ]
         if c["id"] == "A"
     )
     assert card["art"] == ["m2", "m1"]  # best-rated first (m2 9.0 > m1 8.0)
     assert card["total_runtime_s"] == 5400  # 3600 + 1800
 
 
-def test_create_collection_rejects_duplicate_name(db, monkeypatch):
+def test_create_collection_rejects_duplicate_name(db, monkeypatch, override_dep):
     # Same-named collections conflate in Plex, so a create with an existing name (case-insensitive) is
     # rejected 409 — BEFORE any Plex call (the guard runs first, so the DB lane can assert it).
     monkeypatch.setattr(state, "_configured_cache", True)
@@ -146,21 +148,18 @@ def test_create_collection_rejects_duplicate_name(db, monkeypatch):
     user = User(email="dup@example.com")
     db.add(user)
     db.commit()
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    app.dependency_overrides[admin_user] = lambda: user
-    try:
-        r = TestClient(app).post(
-            "/api/plex/collections",
-            json={"library": "1", "title": "marvel", "item_rating_key": "m1"},
-        )
-        assert r.status_code == 409, r.text
-        assert r.json()["detail"] == {"code": "collection", "reason": "name_taken"}
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    override_dep(admin_user, lambda: user)
+    r = TestClient(app).post(
+        "/api/plex/collections",
+        json={"library": "1", "title": "marvel", "item_rating_key": "m1"},
+    )
+    assert r.status_code == 409, r.text
+    assert r.json()["detail"] == {"code": "collection", "reason": "name_taken"}
 
 
-def test_collection_detail_hero_and_ordered_members(db, monkeypatch):
+def test_collection_detail_hero_and_ordered_members(db, monkeypatch, override_dep):
     # The Collection info page: hero aggregates (year range, most-restrictive cert, total runtime) +
     # members ordered by release year then title.
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
@@ -195,7 +194,7 @@ def test_collection_detail_hero_and_ordered_members(db, monkeypatch):
     user = User(email="cd@example.com")
     db.add(user)
     db.commit()
-    d = _get(db, user, monkeypatch, "/api/plex/collections/A").json()
+    d = _get(db, user, monkeypatch, override_dep, "/api/plex/collections/A").json()
     assert d["title"] == "Coll A" and d["summary"] == "S"
     assert d["year_min"] == 1992 and d["year_max"] == 1996
     assert d["content_rating"] == "PG"  # most restrictive of {G, PG}
@@ -270,38 +269,32 @@ def _seed_editable(db):
     return lib, user
 
 
-def _admin_client(db, user, monkeypatch, stub, resync=_resync_ok):
+def _admin_client(db, user, monkeypatch, override_dep, stub, resync=_resync_ok):
     monkeypatch.setattr(state, "_configured_cache", True)
     monkeypatch.setattr(coll_routes, "PlexClient", lambda db: stub)
     monkeypatch.setattr(coll_routes.plex_sync, "resync_collection", resync)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    app.dependency_overrides[admin_user] = lambda: user
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    override_dep(admin_user, lambda: user)
     return TestClient(app)
 
 
-def test_rename_writes_through_to_plex(db, monkeypatch):
+def test_rename_writes_through_to_plex(db, monkeypatch, override_dep):
     _lib, user = _seed_editable(db)
     stub = _CollStub()
-    client = _admin_client(db, user, monkeypatch, stub)
-    try:
-        r = client.patch("/api/plex/collections/A", json={"title": "Renamed"})
-        assert r.status_code == 200, r.text
-        assert "rename_collection" in stub.calls
-    finally:
-        app.dependency_overrides.clear()
+    client = _admin_client(db, user, monkeypatch, override_dep, stub)
+    r = client.patch("/api/plex/collections/A", json={"title": "Renamed"})
+    assert r.status_code == 200, r.text
+    assert "rename_collection" in stub.calls
 
 
-def test_remove_item_writes_through_to_plex(db, monkeypatch):
+def test_remove_item_writes_through_to_plex(db, monkeypatch, override_dep):
     _lib, user = _seed_editable(db)
     stub = _CollStub()
-    client = _admin_client(db, user, monkeypatch, stub)
-    try:
-        r = client.delete("/api/plex/collections/A/items/m1")
-        assert r.status_code == 200, r.text
-        assert "remove_collection_item" in stub.calls
-    finally:
-        app.dependency_overrides.clear()
+    client = _admin_client(db, user, monkeypatch, override_dep, stub)
+    r = client.delete("/api/plex/collections/A/items/m1")
+    assert r.status_code == 200, r.text
+    assert "remove_collection_item" in stub.calls
 
 
 def _resync_create(db, plex, lib, rk):
@@ -312,25 +305,22 @@ def _resync_create(db, plex, lib, rk):
     return col
 
 
-def test_create_writes_through_to_plex(db, monkeypatch):
+def test_create_writes_through_to_plex(db, monkeypatch, override_dep):
     _lib, user = _seed_editable(db)
     stub = _CollStub()
-    client = _admin_client(db, user, monkeypatch, stub, resync=_resync_create)
-    try:
-        r = client.post(
-            "/api/plex/collections",
-            json={"library": "1", "title": "Fresh Coll", "item_rating_key": "m1"},
-        )
-        assert r.status_code == 200, r.text
-        assert "create_collection" in stub.calls
-        body = r.json()
-        assert body["id"] == "NEW"  # the stub's new ratingKey
-        assert body["editable"] is True  # create marks the new collection editable
-    finally:
-        app.dependency_overrides.clear()
+    client = _admin_client(db, user, monkeypatch, override_dep, stub, resync=_resync_create)
+    r = client.post(
+        "/api/plex/collections",
+        json={"library": "1", "title": "Fresh Coll", "item_rating_key": "m1"},
+    )
+    assert r.status_code == 200, r.text
+    assert "create_collection" in stub.calls
+    body = r.json()
+    assert body["id"] == "NEW"  # the stub's new ratingKey
+    assert body["editable"] is True  # create marks the new collection editable
 
 
-def test_create_resync_failure_is_422(db, monkeypatch):
+def test_create_resync_failure_is_422(db, monkeypatch, override_dep):
     # The collection was created in Plex (wrote=True) but the follow-up resync read failed → 422 with
     # the honest "reconcile on the next sync" detail, not a false "write failed".
     _lib, user = _seed_editable(db)
@@ -339,34 +329,28 @@ def test_create_resync_failure_is_422(db, monkeypatch):
     def _boom(db_, plex, lib_, rk):
         raise PlexError("read failed")
 
-    client = _admin_client(db, user, monkeypatch, stub, resync=_boom)
-    try:
-        r = client.post(
-            "/api/plex/collections",
-            json={"library": "1", "title": "Fresh Coll", "item_rating_key": "m1"},
-        )
-        assert r.status_code == 422, r.text
-        assert r.json()["detail"] == {"code": "refused", "reason": "collection_pending_sync"}
-        assert "create_collection" in stub.calls
-    finally:
-        app.dependency_overrides.clear()
+    client = _admin_client(db, user, monkeypatch, override_dep, stub, resync=_boom)
+    r = client.post(
+        "/api/plex/collections",
+        json={"library": "1", "title": "Fresh Coll", "item_rating_key": "m1"},
+    )
+    assert r.status_code == 422, r.text
+    assert r.json()["detail"] == {"code": "refused", "reason": "collection_pending_sync"}
+    assert "create_collection" in stub.calls
 
 
-def test_mutation_failure_returns_422_write_failed(db, monkeypatch):
+def test_mutation_failure_returns_422_write_failed(db, monkeypatch, override_dep):
     # The Plex mutation itself raised → the write never landed → 422 "Plex write failed", and resync
     # is never reached (stub.calls holds only the mutating call).
     _lib, user = _seed_editable(db)
     stub = _CollStub(fail_on="rename_collection")
-    client = _admin_client(db, user, monkeypatch, stub)
-    try:
-        r = client.patch("/api/plex/collections/A", json={"title": "Renamed"})
-        assert r.status_code == 422, r.text
-        assert r.json()["detail"] == {"code": "refused", "reason": "plex_write_failed"}
-    finally:
-        app.dependency_overrides.clear()
+    client = _admin_client(db, user, monkeypatch, override_dep, stub)
+    r = client.patch("/api/plex/collections/A", json={"title": "Renamed"})
+    assert r.status_code == 422, r.text
+    assert r.json()["detail"] == {"code": "refused", "reason": "plex_write_failed"}
 
 
-def test_resync_failure_after_successful_write_is_422_and_rolls_back(db, monkeypatch):
+def test_resync_failure_after_successful_write_is_422_and_rolls_back(db, monkeypatch, override_dep):
     # The mutation landed on Plex; only the follow-up refresh READ failed. We must (a) NOT claim a
     # write failure and NOT use a 5xx (which the frontend treats as offline) → 422 with a "reconcile
     # on the next sync" detail, and (b) roll back any partial local upsert the resync had flushed.
@@ -385,21 +369,18 @@ def test_resync_failure_after_successful_write_is_422_and_rolls_back(db, monkeyp
         db_.flush()
         raise PlexError("read failed")
 
-    client = _admin_client(db, user, monkeypatch, stub, resync=_resync_boom)
-    try:
-        r = client.patch("/api/plex/collections/A", json={"title": "Renamed"})
-        assert r.status_code == 422, r.text
-        assert r.json()["detail"] == {"code": "refused", "reason": "collection_pending_sync"}
-        assert "rename_collection" in stub.calls  # the write DID happen
-    finally:
-        app.dependency_overrides.clear()
+    client = _admin_client(db, user, monkeypatch, override_dep, stub, resync=_resync_boom)
+    r = client.patch("/api/plex/collections/A", json={"title": "Renamed"})
+    assert r.status_code == 422, r.text
+    assert r.json()["detail"] == {"code": "refused", "reason": "collection_pending_sync"}
+    assert "rename_collection" in stub.calls  # the write DID happen
     row = (
         db.execute(select(PlexCollection).where(PlexCollection.rating_key == "A")).scalars().first()
     )
     assert row.title == "My Coll"  # the partial resync upsert was rolled back
 
 
-def test_show_collection_gets_montage_art_from_shows(db, monkeypatch):
+def test_show_collection_gets_montage_art_from_shows(db, monkeypatch, override_dep):
     # A show-library collection must get its montage from PlexShow members (else it renders blank) — the
     # A3 fix that unions movie + show art. Runtime stays 0 (shows have no single duration).
     lib = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
@@ -431,7 +412,9 @@ def test_show_collection_gets_montage_art_from_shows(db, monkeypatch):
     db.commit()
     card = next(
         c
-        for c in _get(db, user, monkeypatch, "/api/plex/collections").json()["collections"]
+        for c in _get(db, user, monkeypatch, override_dep, "/api/plex/collections").json()[
+            "collections"
+        ]
         if c["id"] == "S"
     )
     assert card["art"] == ["s2", "s1"]  # show members, best-rated first
diff --git a/backend/tests/test_plex_detail.py b/backend/tests/test_plex_detail.py
index 1cb0d584..a0f47c4e 100644
--- a/backend/tests/test_plex_detail.py
+++ b/backend/tests/test_plex_detail.py
@@ -191,14 +191,11 @@ def test_enrich_people_batch_persists_detail(db):
 # ---- item_detail serving (DB lane) ---------------------------------------------------------------
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)  # pass the request gate
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)
 
 
 def _user(db, email):
@@ -208,7 +205,7 @@ def _user(db, email):
     return u
 
 
-def test_item_detail_movie_serves_from_row_despite_live_outage(db, monkeypatch):
+def test_item_detail_movie_serves_from_row_despite_live_outage(db, monkeypatch, override_dep):
     """An enriched movie serves cast/IMDb/tagline from the DB row even when the live Plex call raises —
     only markers/streams (which need the live meta) degrade."""
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
@@ -237,7 +234,7 @@ def test_item_detail_movie_serves_from_row_despite_live_outage(db, monkeypatch):
     db.commit()
 
     monkeypatch.setattr(detail_routes, "PlexClient", lambda db: _StubClient(raise_=True))
-    resp = _get(db, user, monkeypatch, "/api/plex/item/m1")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/item/m1")
     assert resp.status_code == 200, resp.text
     body = resp.json()
     assert body["imdb_rating"] == 8.7
@@ -249,7 +246,7 @@ def test_item_detail_movie_serves_from_row_despite_live_outage(db, monkeypatch):
     assert body["markers"] == []  # live fetch failed → markers degrade, but detail survived
 
 
-def test_item_detail_movie_lazy_fills_when_unenriched(db, monkeypatch):
+def test_item_detail_movie_lazy_fills_when_unenriched(db, monkeypatch, override_dep):
     """A not-yet-enriched movie is filled from the live meta on view (and persisted for next time)."""
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
     db.add(lib)
@@ -261,7 +258,7 @@ def test_item_detail_movie_lazy_fills_when_unenriched(db, monkeypatch):
     db.commit()
 
     monkeypatch.setattr(detail_routes, "PlexClient", lambda db: _StubClient(RICH_META))
-    resp = _get(db, user, monkeypatch, "/api/plex/item/m1")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/item/m1")
     assert resp.status_code == 200, resp.text
     assert resp.json()["imdb_id"] == "tt0068646"
     db.refresh(mv)
@@ -270,7 +267,7 @@ def test_item_detail_movie_lazy_fills_when_unenriched(db, monkeypatch):
     assert [c["name"] for c in mv.full_cast] == ["Marlon Brando", "Al Pacino"]
 
 
-def test_item_detail_episode_serves_rich_from_live(db, monkeypatch):
+def test_item_detail_episode_serves_rich_from_live(db, monkeypatch, override_dep):
     """Episodes are never enriched (not in the grid, no HU overlay), so their detail is parsed from the
     live meta the endpoint fetches for markers/streams."""
     lib = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
@@ -288,7 +285,7 @@ def test_item_detail_episode_serves_rich_from_live(db, monkeypatch):
     db.commit()
 
     monkeypatch.setattr(detail_routes, "PlexClient", lambda db: _StubClient(RICH_META))
-    resp = _get(db, user, monkeypatch, "/api/plex/item/e1")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/item/e1")
     assert resp.status_code == 200, resp.text
     body = resp.json()
     assert body["imdb_id"] == "tt0068646"  # from the live meta, not the (NULL) row
@@ -297,7 +294,7 @@ def test_item_detail_episode_serves_rich_from_live(db, monkeypatch):
     assert ep.full_cast is None  # episodes are not persisted/enriched
 
 
-def test_show_detail_serves_from_row(db, monkeypatch):
+def test_show_detail_serves_from_row(db, monkeypatch, override_dep):
     """A show serves cast/IMDb from the DB row; `related` failing (Plex down) must not drop the detail."""
     lib = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
     db.add(lib)
@@ -324,7 +321,7 @@ def test_show_detail_serves_from_row(db, monkeypatch):
         raise RuntimeError("plex unavailable")
 
     monkeypatch.setattr(detail_routes, "_show_enrichment", _boom)
-    resp = _get(db, user, monkeypatch, "/api/plex/show/s1")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/show/s1")
     assert resp.status_code == 200, resp.text
     body = resp.json()["show"]
     assert body["imdb_rating"] == 9.1
@@ -334,7 +331,7 @@ def test_show_detail_serves_from_row(db, monkeypatch):
     assert resp.json()["related"] == []
 
 
-def test_show_detail_lazy_fills_when_unenriched(db, monkeypatch):
+def test_show_detail_lazy_fills_when_unenriched(db, monkeypatch, override_dep):
     """A not-yet-enriched show is filled from the live meta on first view (imdb/full_cast persisted +
     stamped) so subsequent views serve from the row."""
     lib = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
@@ -348,7 +345,7 @@ def test_show_detail_lazy_fills_when_unenriched(db, monkeypatch):
 
     # _show_enrichment returns (live meta, no related) → the fill branch runs.
     monkeypatch.setattr(detail_routes, "_show_enrichment", lambda db_, rk: (RICH_META, []))
-    resp = _get(db, user, monkeypatch, "/api/plex/show/s1")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/show/s1")
     assert resp.status_code == 200, resp.text
     assert resp.json()["show"]["imdb_id"] == "tt0068646"
     db.refresh(show)
diff --git a/backend/tests/test_plex_discover.py b/backend/tests/test_plex_discover.py
index f6d52f50..7ad4cc57 100644
--- a/backend/tests/test_plex_discover.py
+++ b/backend/tests/test_plex_discover.py
@@ -120,24 +120,21 @@ def _seed(db):
     return user
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        client = TestClient(app)  # no context manager: skip lifespan
-        return client.get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    client = TestClient(app)  # no context manager: skip lifespan
+    return client.get(path)
 
 
 def _ids(cards):
     return [c["id"] for c in cards]
 
 
-def test_discover_shape_and_recently_added_order(db, monkeypatch):
+def test_discover_shape_and_recently_added_order(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/discover?scope=both")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=both")
     assert resp.status_code == 200, resp.text
     d = resp.json()
     assert set(d) >= {"continue_watching", "recently_added", "genres", "because_you_watched"}
@@ -148,19 +145,19 @@ def test_discover_shape_and_recently_added_order(db, monkeypatch):
     assert genres.get("Drama") == 2 and genres.get("Comedy") == 1
 
 
-def test_genre_tiles_carry_poster_art(db, monkeypatch):
+def test_genre_tiles_carry_poster_art(db, monkeypatch, override_dep):
     # Each genre tile carries up to 4 poster rating_keys for the 2×2 collage (top_art_keys): the top
     # movies in that genre, best-rated then newest. No ratings here → newest-first; shows are excluded.
     user = _seed(db)
-    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=both").json()
+    d = _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=both").json()
     art = {g["value"]: g["art"] for g in d["genres"]}
     assert art["Drama"] == ["m1", "m3"]  # both Drama movies, m1 (newer) first
     assert art["Comedy"] == ["m2"]
 
 
-def test_continue_watching_movies_and_shows(db, monkeypatch):
+def test_continue_watching_movies_and_shows(db, monkeypatch, override_dep):
     user = _seed(db)
-    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=both").json()
+    d = _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=both").json()
     ids = _ids(d["continue_watching"])
     # The in-progress movie and the show with an in-progress episode are both present; the watched
     # anchor movie (m1) is not. Order is most-recently-progressed first (the show's ep beats m3).
@@ -168,7 +165,7 @@ def test_continue_watching_movies_and_shows(db, monkeypatch):
     assert "m1" not in ids
 
 
-def test_continue_watching_null_status_in_hidden_out(db, monkeypatch):
+def test_continue_watching_null_status_in_hidden_out(db, monkeypatch, override_dep):
     # A started movie whose PlexState.status is NULL is still "in progress": `NULL NOT IN (...)` is NULL
     # (not TRUE), so a bare notin_ would wrongly drop it — the or_(is_(None), notin_) branch keeps it.
     # A hidden started movie must be excluded.
@@ -207,13 +204,15 @@ def test_continue_watching_null_status_in_hidden_out(db, monkeypatch):
     db.commit()
 
     ids = _ids(
-        _get(db, user, monkeypatch, "/api/plex/discover?scope=movie").json()["continue_watching"]
+        _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=movie").json()[
+            "continue_watching"
+        ]
     )
     assert "mn" in ids  # NULL-status started movie IS in progress
     assert "mh" not in ids  # hidden is excluded
 
 
-def test_continue_watching_excludes_fully_watched_show(db, monkeypatch):
+def test_continue_watching_excludes_fully_watched_show(db, monkeypatch, override_dep):
     # A show whose every episode is watched is DONE, not in-progress: the `watched < total` guard must
     # keep it off the Continue-watching rail (a bare `watched > 0` would wrongly resurface it).
     lib_s = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
@@ -248,14 +247,16 @@ def test_continue_watching_excludes_fully_watched_show(db, monkeypatch):
     db.commit()
 
     ids = _ids(
-        _get(db, user, monkeypatch, "/api/plex/discover?scope=show").json()["continue_watching"]
+        _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=show").json()[
+            "continue_watching"
+        ]
     )
     assert "shw" not in ids  # fully watched → excluded from continue-watching
 
 
-def test_because_you_watched_resolves_in_library_recs(db, monkeypatch):
+def test_because_you_watched_resolves_in_library_recs(db, monkeypatch, override_dep):
     user = _seed(db)
-    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=both").json()
+    d = _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=both").json()
     bw = d["because_you_watched"]
     assert bw is not None
     assert bw["anchor"]["id"] == "m1" and bw["anchor"]["title"] == "Anchor Movie"
@@ -263,34 +264,36 @@ def test_because_you_watched_resolves_in_library_recs(db, monkeypatch):
     assert _ids(bw["items"]) == ["m2"]
 
 
-def test_because_you_watched_null_without_history(db, monkeypatch):
+def test_because_you_watched_null_without_history(db, monkeypatch, override_dep):
     _seed(db)
     fresh = User(email="fresh-discover@example.com")
     db.add(fresh)
     db.commit()
-    d = _get(db, fresh, monkeypatch, "/api/plex/discover?scope=both").json()
+    d = _get(db, fresh, monkeypatch, override_dep, "/api/plex/discover?scope=both").json()
     # A user with no watched-and-enriched movie gets no recommendation rail.
     assert d["because_you_watched"] is None
     assert d["continue_watching"] == []
 
 
-def test_surprise_scope_and_bound(db, monkeypatch):
+def test_surprise_scope_and_bound(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/surprise?scope=movie&limit=2")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/surprise?scope=movie&limit=2")
     assert resp.status_code == 200, resp.text
     items = resp.json()["items"]
     assert len(items) <= 2
     assert all(c["type"] == "movie" for c in items)  # scope=movie excludes shows
 
 
-def test_recently_watched_movies_and_episodes(db, monkeypatch):
+def test_recently_watched_movies_and_episodes(db, monkeypatch, override_dep):
     # The rail lists last-fully-watched titles newest-first: a watched MOVIE as its own card, a show as
     # the specific watched EPISODE (with its show title). _seed watches m1 (movie); add a watched episode.
     user = _seed(db)
     ep2 = db.execute(select(PlexItem).where(PlexItem.rating_key == "sh1e2")).scalars().one()
     db.add(PlexState(user_id=user.id, item_id=ep2.id, status="watched", watched_at=NOW))
     db.commit()
-    rw = _get(db, user, monkeypatch, "/api/plex/discover?scope=both").json()["recently_watched"]
+    rw = _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=both").json()[
+        "recently_watched"
+    ]
     by_id = {c["id"]: c for c in rw}
     assert "m1" in by_id and by_id["m1"]["type"] == "movie"
     assert "sh1e2" in by_id and by_id["sh1e2"]["type"] == "episode"
@@ -299,11 +302,13 @@ def test_recently_watched_movies_and_episodes(db, monkeypatch):
     assert set(_ids(rw)) == {"m1", "sh1e2"}
 
 
-def test_surprise_excludes_watched_and_caps_per_kind(db, monkeypatch):
+def test_surprise_excludes_watched_and_caps_per_kind(db, monkeypatch, override_dep):
     # Surprise surfaces only UNSEEN titles: the watched movie (m1) is out; the unwatched (m2), the
     # in-progress movie (m3) and the partially-watched show (sh1) are eligible. Capped at 3 per kind.
     user = _seed(db)
-    items = _get(db, user, monkeypatch, "/api/plex/surprise?scope=both").json()["items"]
+    items = _get(db, user, monkeypatch, override_dep, "/api/plex/surprise?scope=both").json()[
+        "items"
+    ]
     ids = _ids(items)
     assert "m1" not in ids  # watched → excluded
     assert set(ids) <= {"m2", "m3", "sh1"}  # only unseen titles
@@ -311,19 +316,21 @@ def test_surprise_excludes_watched_and_caps_per_kind(db, monkeypatch):
     assert len([c for c in items if c["type"] == "show"]) <= 3
 
 
-def test_discover_scope_movie_excludes_shows(db, monkeypatch):
+def test_discover_scope_movie_excludes_shows(db, monkeypatch, override_dep):
     user = _seed(db)
-    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=movie").json()
+    d = _get(db, user, monkeypatch, override_dep, "/api/plex/discover?scope=movie").json()
     assert all(c["type"] == "movie" for c in d["recently_added"])
     # The show drops out of continue watching under the movie scope.
     assert _ids(d["continue_watching"]) == ["m3"]
 
 
-def test_filters_narrow_every_discover_rail(db, monkeypatch):
+def test_filters_narrow_every_discover_rail(db, monkeypatch, override_dep):
     # The sidebar filters constrain the Discover rails just like the Browse grid (ask 3). A genre=Drama
     # filter keeps only the Drama titles across every rail; the genre-less show and the Comedy rec drop.
     user = _seed(db)
-    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=both&genres=Drama").json()
+    d = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/discover?scope=both&genres=Drama"
+    ).json()
     # Recently-added: m1 + m3 (Drama) survive; Comedy m2 and the genre-less show sh1 are filtered out.
     assert set(_ids(d["recently_added"])) == {"m1", "m3"}
     # Continue-watching: only the in-progress Drama movie remains (the show has no genres → excluded).
@@ -334,10 +341,10 @@ def test_filters_narrow_every_discover_rail(db, monkeypatch):
     assert d["because_you_watched"] is None
 
 
-def test_filters_narrow_surprise(db, monkeypatch):
+def test_filters_narrow_surprise(db, monkeypatch, override_dep):
     user = _seed(db)
-    items = _get(db, user, monkeypatch, "/api/plex/surprise?scope=movie&genres=Comedy").json()[
-        "items"
-    ]
+    items = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/surprise?scope=movie&genres=Comedy"
+    ).json()["items"]
     # Only the one Comedy movie qualifies under the filter.
     assert _ids(items) == ["m2"]
diff --git a/backend/tests/test_plex_facets.py b/backend/tests/test_plex_facets.py
index aad23c77..3d4c87e4 100644
--- a/backend/tests/test_plex_facets.py
+++ b/backend/tests/test_plex_facets.py
@@ -16,7 +16,7 @@ from app.main import app
 from app.models import PlexItem, PlexLibrary, PlexShow, User
 
 
-def test_facets_returns_studio_vocabulary(db, monkeypatch):
+def test_facets_returns_studio_vocabulary(db, monkeypatch, override_dep):
     """E5 S7: /facets returns the studio vocabulary (distinct studio + count) for the sidebar picker."""
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
     db.add(lib)
@@ -33,18 +33,15 @@ def test_facets_returns_studio_vocabulary(db, monkeypatch):
     db.add(user)
     db.commit()
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        resp = TestClient(app).get("/api/plex/facets?scope=movie")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    resp = TestClient(app).get("/api/plex/facets?scope=movie")
     assert resp.status_code == 200, resp.text
     studios = {s["value"]: s["count"] for s in resp.json()["studios"]}
     assert studios == {"Pixar": 2, "A24": 1}
 
 
-def test_facets_survives_json_null_genres(db, monkeypatch):
+def test_facets_survives_json_null_genres(db, monkeypatch, override_dep):
     lib = PlexLibrary(plex_key="1", title="Shows", kind="show", enabled=True)
     db.add(lib)
     db.flush()
@@ -61,13 +58,10 @@ def test_facets_survives_json_null_genres(db, monkeypatch):
     db.execute(text("UPDATE plex_shows SET genres = 'null'::jsonb WHERE rating_key = 's1'"))
     db.commit()
 
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        client = TestClient(app)  # no context-manager: skip lifespan (scheduler/HLS sweep)
-        resp = client.get("/api/plex/facets?scope=show")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    client = TestClient(app)  # no context-manager: skip lifespan (scheduler/HLS sweep)
+    resp = client.get("/api/plex/facets?scope=show")
 
     assert resp.status_code == 200, resp.text
     # The scalar-null show contributes no genres — and, crucially, doesn't abort the whole endpoint.
diff --git a/backend/tests/test_plex_field_scoped_search.py b/backend/tests/test_plex_field_scoped_search.py
index 00fefac9..9c590838 100644
--- a/backend/tests/test_plex_field_scoped_search.py
+++ b/backend/tests/test_plex_field_scoped_search.py
@@ -100,14 +100,11 @@ def _seed(db):
     return {"user": user}
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)
 
 
 def _ids(body):
@@ -115,55 +112,75 @@ def _ids(body):
 
 
 class TestFieldScopedSearch:
-    def test_everywhere_matches_every_facet(self, db, monkeypatch):
+    def test_everywhere_matches_every_facet(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=all").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr&field=all"
+        ).json()
         # title (mt), cast (mp), summary (ms) all land in the item grid; the episode is grouped out
         assert _ids(body) == ["mp", "ms", "mt"]
         assert [e["title"] for e in body["episodes"]] == ["Zephyr Episode"]
 
-    def test_field_all_is_identical_to_default(self, db, monkeypatch):
+    def test_field_all_is_identical_to_default(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        default = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr").json()
-        scoped = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=all").json()
+        default = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr"
+        ).json()
+        scoped = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr&field=all"
+        ).json()
         assert _ids(default) == _ids(scoped) == ["mp", "ms", "mt"]
         assert default["total"] == scoped["total"]
         assert [e["id"] for e in default["episodes"]] == [e["id"] for e in scoped["episodes"]]
 
-    def test_title_scope_narrows_to_title_match(self, db, monkeypatch):
+    def test_title_scope_narrows_to_title_match(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=title").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr&field=title"
+        ).json()
         assert _ids(body) == ["mt"]
         assert body["total"] == 1
         assert body["episodes"] == []  # non-episode field scopes suppress the episode section
 
-    def test_people_scope_narrows_to_cast_match(self, db, monkeypatch):
+    def test_people_scope_narrows_to_cast_match(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=people").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr&field=people"
+        ).json()
         assert _ids(body) == ["mp"]
 
-    def test_summary_scope_narrows_to_description_match(self, db, monkeypatch):
+    def test_summary_scope_narrows_to_description_match(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=summary").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr&field=summary"
+        ).json()
         assert _ids(body) == ["ms"]
 
-    def test_episode_scope_empties_grid_and_returns_episode(self, db, monkeypatch):
+    def test_episode_scope_empties_grid_and_returns_episode(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=episode").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr&field=episode"
+        ).json()
         assert body["items"] == []
         assert body["total"] == 0
         assert [e["title"] for e in body["episodes"]] == ["Zephyr Episode"]
 
-    def test_episode_scope_needs_shows_in_scope(self, db, monkeypatch):
+    def test_episode_scope_needs_shows_in_scope(self, db, monkeypatch, override_dep):
         s = _seed(db)
         body = _get(
-            db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=episode&scope=movie"
+            db,
+            s["user"],
+            monkeypatch,
+            override_dep,
+            "/api/plex/library?q=zephyr&field=episode&scope=movie",
         ).json()
         # movie-only scope has no show libraries -> no episodes to surface, and the grid stays empty
         assert body["items"] == []
         assert body["episodes"] == []
 
-    def test_unknown_field_falls_back_to_everywhere(self, db, monkeypatch):
+    def test_unknown_field_falls_back_to_everywhere(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?q=zephyr&field=bogus").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=zephyr&field=bogus"
+        ).json()
         assert _ids(body) == ["mp", "ms", "mt"]
diff --git a/backend/tests/test_plex_hls_file_route.py b/backend/tests/test_plex_hls_file_route.py
index a7a680c7..127086bb 100644
--- a/backend/tests/test_plex_hls_file_route.py
+++ b/backend/tests/test_plex_hls_file_route.py
@@ -62,14 +62,11 @@ def sessions(monkeypatch):
 
 
 @pytest.fixture
-def client(monkeypatch):
+def client(monkeypatch, override_dep):
     monkeypatch.setattr(state, "_configured_cache", True)
     user = User(id=VIEWER, email="hls@example.com")
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        yield TestClient(app)
-    finally:
-        app.dependency_overrides.pop(current_user, None)
+    override_dep(current_user, lambda: user)
+    return TestClient(app)
 
 
 def test_a_segment_is_served_from_the_session_the_url_names(client, tmp_path, sessions):
diff --git a/backend/tests/test_plex_keyword_filter.py b/backend/tests/test_plex_keyword_filter.py
index c0ffc3a0..930d3407 100644
--- a/backend/tests/test_plex_keyword_filter.py
+++ b/backend/tests/test_plex_keyword_filter.py
@@ -41,34 +41,33 @@ def _seed(db):
     return user
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)
 
 
 def _titles(resp):
     return {i["title"] for i in resp.json()["items"]}
 
 
-def test_keyword_filter_narrows_to_matching_rows(db, monkeypatch):
+def test_keyword_filter_narrows_to_matching_rows(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&keywords=heist")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&keywords=heist")
     assert resp.status_code == 200, resp.text
     assert _titles(resp) == {"Heist Movie"}
 
 
-def test_no_keyword_filter_returns_all(db, monkeypatch):
+def test_no_keyword_filter_returns_all(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/library?scope=movie")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie")
     assert _titles(resp) == {"Heist Movie", "Space Movie", "No Keywords Movie"}
 
 
-def test_unknown_keyword_matches_nothing(db, monkeypatch):
+def test_unknown_keyword_matches_nothing(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&keywords=nonesuch")
+    resp = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&keywords=nonesuch"
+    )
     assert resp.json()["items"] == []
diff --git a/backend/tests/test_plex_lang.py b/backend/tests/test_plex_lang.py
index 657cfc4a..9600cbfc 100644
--- a/backend/tests/test_plex_lang.py
+++ b/backend/tests/test_plex_lang.py
@@ -56,54 +56,55 @@ def _seed(db):
     return user
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(
         state, "_configured_cache", True
     )  # the request gate 503s an unconfigured app
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        client = TestClient(app)  # no context manager: skip lifespan
-        return client.get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    client = TestClient(app)  # no context manager: skip lifespan
+    return client.get(path)
 
 
 def _titles(resp):
     return {i["title"] for i in resp.json()["items"]}
 
 
-def test_library_serves_active_language_titles(db, monkeypatch):
+def test_library_serves_active_language_titles(db, monkeypatch, override_dep):
     user = _seed(db)
-    hu = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&lang=hu")
-    en = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&lang=en")
+    hu = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu")
+    en = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=en")
     # HU serves the twin's Hungarian title; the EN-only row falls back to its English title.
     assert _titles(hu) == {"Magyar Cím", "EN Only"}
     assert _titles(en) == {"English Title", "EN Only"}
 
 
-def test_facets_vocabulary_is_language_specific(db, monkeypatch):
+def test_facets_vocabulary_is_language_specific(db, monkeypatch, override_dep):
     user = _seed(db)
-    hu = _get(db, user, monkeypatch, "/api/plex/facets?scope=movie&lang=hu")
-    en = _get(db, user, monkeypatch, "/api/plex/facets?scope=movie&lang=en")
+    hu = _get(db, user, monkeypatch, override_dep, "/api/plex/facets?scope=movie&lang=hu")
+    en = _get(db, user, monkeypatch, override_dep, "/api/plex/facets?scope=movie&lang=en")
     hu_genres = {g["value"] for g in hu.json()["genres"]}
     en_genres = {g["value"] for g in en.json()["genres"]}
     assert "Dráma" in hu_genres and "Drama" not in hu_genres
     assert "Drama" in en_genres and "Dráma" not in en_genres
 
 
-def test_genre_filter_matches_active_language_vocabulary(db, monkeypatch):
+def test_genre_filter_matches_active_language_vocabulary(db, monkeypatch, override_dep):
     user = _seed(db)
     # The HU genre chip filters the HU column; the same string against the EN column matches nothing.
-    hit = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&lang=hu&genres=Dráma")
-    miss = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&lang=en&genres=Dráma")
+    hit = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu&genres=Dráma"
+    )
+    miss = _get(
+        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=en&genres=Dráma"
+    )
     assert _titles(hit) == {"Magyar Cím"}
     assert miss.json()["items"] == []
 
 
-def test_item_detail_language_and_rating_split(db, monkeypatch):
+def test_item_detail_language_and_rating_split(db, monkeypatch, override_dep):
     user = _seed(db)
-    resp = _get(db, user, monkeypatch, "/api/plex/item/m1?lang=hu")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/item/m1?lang=hu")
     body = resp.json()
     assert body["title"] == "Magyar Cím"
     assert body["summary"] == "Magyar összefoglaló."
@@ -112,15 +113,15 @@ def test_item_detail_language_and_rating_split(db, monkeypatch):
     assert body["rating"] == 6.5
 
 
-def test_hu_search_still_finds_en_only_titles(db, monkeypatch):
+def test_hu_search_still_finds_en_only_titles(db, monkeypatch, override_dep):
     user = _seed(db)
     # m2 ("EN Only") has no HU twin, so search_vector_hu carries no title tokens for it. HU-mode search
     # must still match it via the EN vector (vector_match's union) — findable by its English title.
-    resp = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&lang=hu&q=Only")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu&q=Only")
     assert "EN Only" in _titles(resp)
 
 
-def test_rating_filter_prefers_imdb_over_audience(db, monkeypatch):
+def test_rating_filter_prefers_imdb_over_audience(db, monkeypatch, override_dep):
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
     db.add(lib)
     db.flush()
@@ -142,7 +143,7 @@ def test_rating_filter_prefers_imdb_over_audience(db, monkeypatch):
     user = User(email="rating@example.com")
     db.add(user)
     db.commit()
-    hit = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&rating_min=7")
+    hit = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&rating_min=7")
     assert "High IMDb" in _titles(hit)
-    miss = _get(db, user, monkeypatch, "/api/plex/library?scope=movie&rating_min=9")
+    miss = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&rating_min=9")
     assert "High IMDb" not in _titles(miss)
diff --git a/backend/tests/test_plex_last_watched_sort.py b/backend/tests/test_plex_last_watched_sort.py
index 60060591..6839c9ee 100644
--- a/backend/tests/test_plex_last_watched_sort.py
+++ b/backend/tests/test_plex_last_watched_sort.py
@@ -111,44 +111,53 @@ def _seed(db):
     return user
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)
 
 
 def _ids(resp):
     return [i["id"] for i in resp.json()["items"]]
 
 
-def test_movies_ordered_by_last_watched_desc(db, monkeypatch):
+def test_movies_ordered_by_last_watched_desc(db, monkeypatch, override_dep):
     user = _seed(db)
     resp = _get(
-        db, user, monkeypatch, "/api/plex/library?scope=movie&sort=lastwatched&sort_dir=desc"
+        db,
+        user,
+        monkeypatch,
+        override_dep,
+        "/api/plex/library?scope=movie&sort=lastwatched&sort_dir=desc",
     )
     assert resp.status_code == 200, resp.text
     # Newest resume, then the watched-only (coalesce → watched_at), then the older resume, then never.
     assert _ids(resp) == ["mo_new", "mo_watched", "mo_old", "mo_never"]
 
 
-def test_shows_ordered_by_last_watched_desc(db, monkeypatch):
+def test_shows_ordered_by_last_watched_desc(db, monkeypatch, override_dep):
     user = _seed(db)
     resp = _get(
-        db, user, monkeypatch, "/api/plex/library?scope=show&sort=lastwatched&sort_dir=desc"
+        db,
+        user,
+        monkeypatch,
+        override_dep,
+        "/api/plex/library?scope=show&sort=lastwatched&sort_dir=desc",
     )
     assert resp.status_code == 200, resp.text
     # Recent resume first, then the watched-only show, then the never-watched one (nullslast).
     assert _ids(resp) == ["sh_recent", "sh_watched", "sh_never"]
 
 
-def test_last_watched_mixed_scope_nullslast(db, monkeypatch):
+def test_last_watched_mixed_scope_nullslast(db, monkeypatch, override_dep):
     user = _seed(db)
     resp = _get(
-        db, user, monkeypatch, "/api/plex/library?scope=both&sort=lastwatched&sort_dir=desc"
+        db,
+        user,
+        monkeypatch,
+        override_dep,
+        "/api/plex/library?scope=both&sort=lastwatched&sort_dir=desc",
     )
     assert resp.status_code == 200, resp.text
     ids = _ids(resp)
diff --git a/backend/tests/test_plex_person.py b/backend/tests/test_plex_person.py
index 760aac7c..2d1b4bad 100644
--- a/backend/tests/test_plex_person.py
+++ b/backend/tests/test_plex_person.py
@@ -25,17 +25,14 @@ from app.plex.query import content_libs
 NAME = "Robert De Niro"
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)  # pass the request gate
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)  # no lifespan (skip scheduler/HLS sweep)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)  # no lifespan (skip scheduler/HLS sweep)
 
 
-def test_person_detail_returns_cast_and_director_credits(db, monkeypatch):
+def test_person_detail_returns_cast_and_director_credits(db, monkeypatch, override_dep):
     movies_lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
     shows_lib = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
     off_lib = PlexLibrary(plex_key="3", title="Off", kind="movie", enabled=False)
@@ -89,7 +86,7 @@ def test_person_detail_returns_cast_and_director_credits(db, monkeypatch):
     db.add(PlexState(user_id=user.id, item_id=heat.id, status="watched"))
     db.commit()
 
-    resp = _get(db, user, monkeypatch, f"/api/plex/person/{NAME.replace(' ', '%20')}")
+    resp = _get(db, user, monkeypatch, override_dep, f"/api/plex/person/{NAME.replace(' ', '%20')}")
     assert resp.status_code == 200, resp.text
     body = resp.json()
 
@@ -106,7 +103,7 @@ def test_person_detail_returns_cast_and_director_credits(db, monkeypatch):
     assert body["shows"][0]["type"] == "show"
 
 
-def test_person_detail_unknown_name_is_empty(db, monkeypatch):
+def test_person_detail_unknown_name_is_empty(db, monkeypatch, override_dep):
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
     db.add(lib)
     db.flush()
@@ -123,7 +120,7 @@ def test_person_detail_unknown_name_is_empty(db, monkeypatch):
     db.add(user)
     db.commit()
 
-    resp = _get(db, user, monkeypatch, "/api/plex/person/Ghost%20Actor")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/person/Ghost%20Actor")
     assert resp.status_code == 200, resp.text
     body = resp.json()
     # An unknown name has no plex_people row → no bio, no titles (E5 S6 added the bio fields, all null).
diff --git a/backend/tests/test_plex_person_bio.py b/backend/tests/test_plex_person_bio.py
index 92985d66..532a9e19 100644
--- a/backend/tests/test_plex_person_bio.py
+++ b/backend/tests/test_plex_person_bio.py
@@ -168,17 +168,14 @@ def test_enrich_person_noop_without_tmdb_id(db, monkeypatch):
     assert plex_tmdb.enrich_person(db, person) is False
 
 
-def _get(db, user, monkeypatch, path):
+def _get(db, user, monkeypatch, override_dep, path):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).get(path)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).get(path)
 
 
-def test_person_detail_schedules_enrich_off_request_path(db, monkeypatch):
+def test_person_detail_schedules_enrich_off_request_path(db, monkeypatch, override_dep):
     # The bio fetch runs OFF the request path (a background task after the response), so the serve never
     # makes a live TMDB call. An un-enriched person (tmdb_person_id set + tmdb_enriched_at None) schedules
     # the enrich and the page still renders immediately with whatever's in the row (bio still null).
@@ -196,7 +193,7 @@ def test_person_detail_schedules_enrich_off_request_path(db, monkeypatch):
     monkeypatch.setattr(people, "_enrich_person_bg", lambda pid: scheduled.append(pid))
     people._enrich_inflight.clear()  # ensure the per-person cooldown guard doesn't suppress this open
 
-    resp = _get(db, user, monkeypatch, "/api/plex/person/Lazy P")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/person/Lazy P")
     assert resp.status_code == 200, resp.text
     assert resp.json()["biography"] is None  # not enriched yet — the bio lands by the next open
     assert len(scheduled) == 1  # the enrich was scheduled off the request path
@@ -260,7 +257,7 @@ def test_should_schedule_enrich_dedups_within_cooldown():
     people._enrich_inflight.clear()
 
 
-def test_person_detail_no_enrich_when_already_enriched(db, monkeypatch):
+def test_person_detail_no_enrich_when_already_enriched(db, monkeypatch, override_dep):
     # An already-enriched person (tmdb_enriched_at set) must NOT schedule another background fetch.
     from datetime import datetime, timezone
 
@@ -284,13 +281,13 @@ def test_person_detail_no_enrich_when_already_enriched(db, monkeypatch):
     scheduled: list[int] = []
     monkeypatch.setattr(people, "_enrich_person_bg", lambda pid: scheduled.append(pid))
 
-    resp = _get(db, user, monkeypatch, "/api/plex/person/Done P")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/person/Done P")
     assert resp.status_code == 200, resp.text
     assert resp.json()["biography"] == "Bio."
     assert scheduled == []  # already enriched → no background work
 
 
-def test_person_detail_serves_bio_and_resolves_known_for(db, monkeypatch):
+def test_person_detail_serves_bio_and_resolves_known_for(db, monkeypatch, override_dep):
     lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
     db.add(lib)
     db.flush()
@@ -327,7 +324,7 @@ def test_person_detail_serves_bio_and_resolves_known_for(db, monkeypatch):
     db.add(user)
     db.commit()
 
-    resp = _get(db, user, monkeypatch, "/api/plex/person/Actor X")
+    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/person/Actor X")
     assert resp.status_code == 200, resp.text
     j = resp.json()
     assert j["biography"] == "Bio here."
diff --git a/backend/tests/test_plex_playback_class.py b/backend/tests/test_plex_playback_class.py
index 627c09c2..07788930 100644
--- a/backend/tests/test_plex_playback_class.py
+++ b/backend/tests/test_plex_playback_class.py
@@ -347,47 +347,41 @@ def _seed_classes(db):
     return lib
 
 
-def _client(db, user, monkeypatch):
+def _client(db, user, monkeypatch, override_dep):
     monkeypatch.setattr(state, "_configured_cache", True)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
     return TestClient(app)
 
 
-def test_library_filters_by_playback_class(db, monkeypatch):
+def test_library_filters_by_playback_class(db, monkeypatch, override_dep):
     _seed_classes(db)
     user = User(email="pclass@example.com")
     db.add(user)
     db.commit()
-    client = _client(db, user, monkeypatch)
-    try:
-        # Software-only transcodes.
-        sw = client.get("/api/plex/library?scope=movie&playable=transcode_sw")
-        assert sw.status_code == 200, sw.text
-        assert {i["id"] for i in sw.json()["items"]} == {"tsw"}
-        # HW transcode + Direct Play, OR-combined.
-        both = client.get("/api/plex/library?scope=movie&playable=transcode_hw,direct")
-        assert {i["id"] for i in both.json()["items"]} == {"thw", "d1"}
-        # The HW card carries the transcode_hw flag for the 4-way badge.
-        card = next(i for i in both.json()["items"] if i["id"] == "thw")
-        assert card["transcode_hw"] is True
-        # No filter → everything.
-        allm = client.get("/api/plex/library?scope=movie")
-        assert {i["id"] for i in allm.json()["items"]} == {"d1", "r1", "thw", "tsw"}
-    finally:
-        app.dependency_overrides.clear()
+    client = _client(db, user, monkeypatch, override_dep)
+    # Software-only transcodes.
+    sw = client.get("/api/plex/library?scope=movie&playable=transcode_sw")
+    assert sw.status_code == 200, sw.text
+    assert {i["id"] for i in sw.json()["items"]} == {"tsw"}
+    # HW transcode + Direct Play, OR-combined.
+    both = client.get("/api/plex/library?scope=movie&playable=transcode_hw,direct")
+    assert {i["id"] for i in both.json()["items"]} == {"thw", "d1"}
+    # The HW card carries the transcode_hw flag for the 4-way badge.
+    card = next(i for i in both.json()["items"] if i["id"] == "thw")
+    assert card["transcode_hw"] is True
+    # No filter → everything.
+    allm = client.get("/api/plex/library?scope=movie")
+    assert {i["id"] for i in allm.json()["items"]} == {"d1", "r1", "thw", "tsw"}
 
 
-def test_facets_count_playback_classes_in_severity_order(db, monkeypatch):
+def test_facets_count_playback_classes_in_severity_order(db, monkeypatch, override_dep):
     _seed_classes(db)
     user = User(email="pclassfacet@example.com")
     db.add(user)
     db.commit()
-    client = _client(db, user, monkeypatch)
-    try:
-        resp = client.get("/api/plex/facets?scope=movie")
-    finally:
-        app.dependency_overrides.clear()
+    client = _client(db, user, monkeypatch, override_dep)
+    resp = client.get("/api/plex/facets?scope=movie")
     assert resp.status_code == 200, resp.text
     playable = resp.json()["playable"]
     # Fixed good→heavy order (not by count), one per seeded class.
@@ -400,7 +394,7 @@ def test_facets_count_playback_classes_in_severity_order(db, monkeypatch):
     }
 
 
-def test_unprobed_transcode_folds_into_sw(db, monkeypatch):
+def test_unprobed_transcode_folds_into_sw(db, monkeypatch, override_dep):
     # transcode_hw NULL is the COMMON initial state (before the bit-depth backfill runs). The query's
     # CASE has no explicit NULL arm — it relies on the `playable=='transcode'` else folding NULL in with
     # software. Pin that fold for BOTH the filter and the facet, so a reorder can't silently drop the
@@ -422,20 +416,17 @@ def test_unprobed_transcode_folds_into_sw(db, monkeypatch):
     user = User(email="pnull@example.com")
     db.add(user)
     db.commit()
-    client = _client(db, user, monkeypatch)
-    try:
-        sw = client.get("/api/plex/library?scope=movie&playable=transcode_sw")
-        assert {i["id"] for i in sw.json()["items"]} == {"tnull"}  # NULL → SW bucket
-        hw = client.get("/api/plex/library?scope=movie&playable=transcode_hw")
-        assert hw.json()["items"] == []  # never HW
-        facets = client.get("/api/plex/facets?scope=movie")
-        counts = {p["value"]: p["count"] for p in facets.json()["playable"]}
-        assert counts.get("transcode_sw") == 1 and counts.get("transcode_hw", 0) == 0
-    finally:
-        app.dependency_overrides.clear()
+    client = _client(db, user, monkeypatch, override_dep)
+    sw = client.get("/api/plex/library?scope=movie&playable=transcode_sw")
+    assert {i["id"] for i in sw.json()["items"]} == {"tnull"}  # NULL → SW bucket
+    hw = client.get("/api/plex/library?scope=movie&playable=transcode_hw")
+    assert hw.json()["items"] == []  # never HW
+    facets = client.get("/api/plex/facets?scope=movie")
+    counts = {p["value"]: p["count"] for p in facets.json()["playable"]}
+    assert counts.get("transcode_sw") == 1 and counts.get("transcode_hw", 0) == 0
 
 
-def test_facet_playable_self_excludes_the_active_selection(db, monkeypatch):
+def test_facet_playable_self_excludes_the_active_selection(db, monkeypatch, override_dep):
     # A selected playable class must NOT narrow the playable facet's OWN counts (facet self-exclusion),
     # otherwise picking one class would collapse the list and you couldn't OR-add a second. Selecting
     # 'direct' must still return all four classes at their full, unnarrowed counts.
@@ -443,17 +434,14 @@ def test_facet_playable_self_excludes_the_active_selection(db, monkeypatch):
     user = User(email="pself@example.com")
     db.add(user)
     db.commit()
-    client = _client(db, user, monkeypatch)
-    try:
-        resp = client.get("/api/plex/facets?scope=movie&playable=direct")
-    finally:
-        app.dependency_overrides.clear()
+    client = _client(db, user, monkeypatch, override_dep)
+    resp = client.get("/api/plex/facets?scope=movie&playable=direct")
     assert resp.status_code == 200, resp.text
     counts = {p["value"]: p["count"] for p in resp.json()["playable"]}
     assert counts == {"direct": 1, "remux": 1, "transcode_hw": 1, "transcode_sw": 1}
 
 
-def test_active_playable_narrows_the_other_facets(db, monkeypatch):
+def test_active_playable_narrows_the_other_facets(db, monkeypatch, override_dep):
     # The flip side of self-exclusion: an active playable class DOES narrow the OTHER facet groups (so
     # e.g. the year range reflects only the selected class). Seed a Direct movie (2000) and a
     # software-transcode movie (2020); selecting playable=direct must collapse the year facet to 2000.
@@ -485,11 +473,8 @@ def test_active_playable_narrows_the_other_facets(db, monkeypatch):
     user = User(email="pnarrow@example.com")
     db.add(user)
     db.commit()
-    client = _client(db, user, monkeypatch)
-    try:
-        wide = client.get("/api/plex/facets?scope=movie").json()
-        narrow = client.get("/api/plex/facets?scope=movie&playable=direct").json()
-    finally:
-        app.dependency_overrides.clear()
+    client = _client(db, user, monkeypatch, override_dep)
+    wide = client.get("/api/plex/facets?scope=movie").json()
+    narrow = client.get("/api/plex/facets?scope=movie&playable=direct").json()
     assert (wide["year_min"], wide["year_max"]) == (2000, 2020)  # both classes span the range
     assert (narrow["year_min"], narrow["year_max"]) == (2000, 2000)  # narrowed to the Direct subset
diff --git a/backend/tests/test_plex_playback_session.py b/backend/tests/test_plex_playback_session.py
index c868e329..ef22ad07 100644
--- a/backend/tests/test_plex_playback_session.py
+++ b/backend/tests/test_plex_playback_session.py
@@ -48,7 +48,7 @@ def _user(db, email="play@example.com"):
     return u
 
 
-def _post(db, user, monkeypatch, rating_key, *, captured):
+def _post(db, user, monkeypatch, override_dep, rating_key, *, captured):
     """Drive the endpoint with ffmpeg stubbed out. `start_session` records the `transcode` flag it
     was called with into `captured` and returns a stand-in session echoing it back."""
     monkeypatch.setattr(state, "_configured_cache", True)  # pass the request gate
@@ -67,20 +67,17 @@ def _post(db, user, monkeypatch, rating_key, *, captured):
         )
 
     monkeypatch.setattr(plex_stream, "start_session", fake_start)
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        return TestClient(app).post(f"/api/plex/stream/{rating_key}/session")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    return TestClient(app).post(f"/api/plex/stream/{rating_key}/session")
 
 
-def test_transcode_item_routes_to_an_hls_reencode_session(db, monkeypatch):
+def test_transcode_item_routes_to_an_hls_reencode_session(db, monkeypatch, override_dep):
     # A non-h264 item (formerly HTTP 501) now plays: mode=hls, transcode=True threaded to start_session.
     it = _item(db, playable="transcode")
     user = _user(db)
     captured: dict = {}
-    resp = _post(db, user, monkeypatch, it.rating_key, captured=captured)
+    resp = _post(db, user, monkeypatch, override_dep, it.rating_key, captured=captured)
     assert resp.status_code == 200, resp.text
     body = resp.json()
     assert body["mode"] == "hls"
@@ -88,12 +85,12 @@ def test_transcode_item_routes_to_an_hls_reencode_session(db, monkeypatch):
     assert captured["transcode"] is True  # start_session was told to re-encode
 
 
-def test_remux_item_stays_a_stream_copy_session(db, monkeypatch):
+def test_remux_item_stays_a_stream_copy_session(db, monkeypatch, override_dep):
     # A remux (h264) item takes the SAME HLS path but must NOT re-encode.
     it = _item(db, playable="remux", rating_key="m2")
     user = _user(db, "remux@example.com")
     captured: dict = {}
-    resp = _post(db, user, monkeypatch, it.rating_key, captured=captured)
+    resp = _post(db, user, monkeypatch, override_dep, it.rating_key, captured=captured)
     assert resp.status_code == 200, resp.text
     body = resp.json()
     assert body["mode"] == "hls"
@@ -101,12 +98,12 @@ def test_remux_item_stays_a_stream_copy_session(db, monkeypatch):
     assert captured["transcode"] is False
 
 
-def test_direct_item_never_opens_a_session(db, monkeypatch):
+def test_direct_item_never_opens_a_session(db, monkeypatch, override_dep):
     # A browser-native file is served raw — start_session is never reached, so no transcode decision.
     it = _item(db, playable="direct", rating_key="m3")
     user = _user(db, "direct@example.com")
     captured: dict = {}
-    resp = _post(db, user, monkeypatch, it.rating_key, captured=captured)
+    resp = _post(db, user, monkeypatch, override_dep, it.rating_key, captured=captured)
     assert resp.status_code == 200, resp.text
     assert resp.json()["mode"] == "direct"
     assert "transcode" not in captured  # start_session not called
diff --git a/backend/tests/test_plex_query_conversion.py b/backend/tests/test_plex_query_conversion.py
index b8e63db9..a0300882 100644
--- a/backend/tests/test_plex_query_conversion.py
+++ b/backend/tests/test_plex_query_conversion.py
@@ -96,27 +96,26 @@ def _seed(db):
     return {"user": user, "movie_lib": movie_lib, "show_lib": show_lib, "show": show}
 
 
-def _request(db, user, monkeypatch, method, path, json=None):
+def _request(db, user, monkeypatch, override_dep, method, path, json=None):
     monkeypatch.setattr(
         state, "_configured_cache", True
     )  # the request gate 503s an unconfigured app
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user
-    try:
-        client = TestClient(app)  # no context manager: skip lifespan (scheduler/HLS sweep)
-        return client.request(method, path, json=json)
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)
+    client = TestClient(app)  # no context manager: skip lifespan (scheduler/HLS sweep)
+    return client.request(method, path, json=json)
 
 
-def _get(db, user, monkeypatch, path):
-    return _request(db, user, monkeypatch, "GET", path)
+def _get(db, user, monkeypatch, override_dep, path):
+    return _request(db, user, monkeypatch, override_dep, "GET", path)
 
 
 class TestUnifiedLibrary:
-    def test_both_scope_unions_movies_and_shows_ordered_by_added(self, db, monkeypatch):
+    def test_both_scope_unions_movies_and_shows_ordered_by_added(
+        self, db, monkeypatch, override_dep
+    ):
         s = _seed(db)
-        r = _get(db, s["user"], monkeypatch, "/api/plex/library?scope=both")
+        r = _get(db, s["user"], monkeypatch, override_dep, "/api/plex/library?scope=both")
         assert r.status_code == 200, r.text
         body = r.json()
         assert body["total"] == 3  # 2 movies + 1 show, unioned
@@ -127,43 +126,53 @@ class TestUnifiedLibrary:
         assert show_item["season_count"] == 1
         assert next(i for i in body["items"] if i["id"] == "m1")["status"] == "watched"
 
-    def test_scope_movie_only(self, db, monkeypatch):
+    def test_scope_movie_only(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?scope=movie").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?scope=movie"
+        ).json()
         assert body["total"] == 2
         assert all(i["type"] == "movie" for i in body["items"])
 
-    def test_scope_show_only(self, db, monkeypatch):
+    def test_scope_show_only(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?scope=show").json()
+        body = _get(db, s["user"], monkeypatch, override_dep, "/api/plex/library?scope=show").json()
         assert [i["id"] for i in body["items"]] == ["s1"]
         assert body["items"][0]["season_count"] == 1
 
-    def test_watch_state_branches(self, db, monkeypatch):
+    def test_watch_state_branches(self, db, monkeypatch, override_dep):
         s = _seed(db)
         # watched: only movie m1 (the show is in_progress, not fully watched)
-        watched = _get(db, s["user"], monkeypatch, "/api/plex/library?show=watched").json()
+        watched = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?show=watched"
+        ).json()
         assert [i["id"] for i in watched["items"]] == ["m1"]
         # in_progress: only the show (no movie is in progress)
-        inprog = _get(db, s["user"], monkeypatch, "/api/plex/library?show=in_progress").json()
+        inprog = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?show=in_progress"
+        ).json()
         assert [i["id"] for i in inprog["items"]] == ["s1"]
         # unwatched: only movie m2 (no state). The show is EXCLUDED — "unwatched" for a show means
         # 0 watched AND 0 in-progress episodes, and e1 is in-progress. (Locks the actual branch.)
-        unwatched = _get(db, s["user"], monkeypatch, "/api/plex/library?show=unwatched").json()
+        unwatched = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?show=unwatched"
+        ).json()
         assert [i["id"] for i in unwatched["items"]] == ["m2"]
 
-    def test_search_matches_by_rank_and_groups_episodes(self, db, monkeypatch):
+    def test_search_matches_by_rank_and_groups_episodes(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?q=charlie").json()
+        body = _get(db, s["user"], monkeypatch, override_dep, "/api/plex/library?q=charlie").json()
         # only the show title matches in the item grid; the movies don't contain "charlie"
         assert [i["id"] for i in body["items"]] == ["s1"]
         assert body["total"] == 1
         # matching episodes come back grouped in the separate episodes list
         assert sorted(e["title"] for e in body["episodes"]) == ["Charlie Finale", "Charlie Pilot"]
 
-    def test_pagination_caps_items_not_total(self, db, monkeypatch):
+    def test_pagination_caps_items_not_total(self, db, monkeypatch, override_dep):
         s = _seed(db)
-        body = _get(db, s["user"], monkeypatch, "/api/plex/library?limit=2&offset=0").json()
+        body = _get(
+            db, s["user"], monkeypatch, override_dep, "/api/plex/library?limit=2&offset=0"
+        ).json()
         assert body["total"] == 3
         assert [i["id"] for i in body["items"]] == [
             "s1",
@@ -267,7 +276,7 @@ class TestFacetsWithData:
     JSONB unnest + year/rating/duration bounds + the watch-state join). The existing smoke test only
     covers the null-genre guard; this locks the aggregated numbers with real data."""
 
-    def test_facet_aggregation(self, db, monkeypatch):
+    def test_facet_aggregation(self, db, monkeypatch, override_dep):
         movie_lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
         show_lib = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
         db.add_all([movie_lib, show_lib])
@@ -311,7 +320,7 @@ class TestFacetsWithData:
         db.add(user)
         db.commit()
 
-        body = _get(db, user, monkeypatch, "/api/plex/facets?scope=both").json()
+        body = _get(db, user, monkeypatch, override_dep, "/api/plex/facets?scope=both").json()
         assert {g["value"]: g["count"] for g in body["genres"]} == {"Comedy": 2, "Drama": 2}
         assert {c["value"]: c["count"] for c in body["content_ratings"]} == {
             "PG": 1,
@@ -332,7 +341,7 @@ class TestPlaylistAndCollectionEndpoints:
     def _movie(self, db, lib_id, rk, title):
         return PlexItem(rating_key=rk, library_id=lib_id, kind="movie", title=title)
 
-    def test_playlist_crud_roundtrip(self, db, monkeypatch):
+    def test_playlist_crud_roundtrip(self, db, monkeypatch, override_dep):
         lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
         db.add(lib)
         db.flush()
@@ -348,6 +357,7 @@ class TestPlaylistAndCollectionEndpoints:
             db,
             user,
             monkeypatch,
+            override_dep,
             "POST",
             "/api/plex/playlists",
             {"title": "Faves", "item_rating_key": "m1"},
@@ -357,7 +367,9 @@ class TestPlaylistAndCollectionEndpoints:
         assert created.json()["item_count"] == 1
 
         # list -> the playlist with its count
-        listed = _get(db, user, monkeypatch, "/api/plex/playlists").json()["playlists"]
+        listed = _get(db, user, monkeypatch, override_dep, "/api/plex/playlists").json()[
+            "playlists"
+        ]
         assert [(p["id"], p["item_count"]) for p in listed] == [(pid, 1)]
 
         # add m2, then reorder to [m2, m1]
@@ -365,6 +377,7 @@ class TestPlaylistAndCollectionEndpoints:
             db,
             user,
             monkeypatch,
+            override_dep,
             "POST",
             f"/api/plex/playlists/{pid}/items",
             {"item_rating_key": "m2"},
@@ -374,24 +387,30 @@ class TestPlaylistAndCollectionEndpoints:
             db,
             user,
             monkeypatch,
+            override_dep,
             "PUT",
             f"/api/plex/playlists/{pid}/order",
             {"item_rating_keys": ["m2", "m1"]},
         )
-        detail = _get(db, user, monkeypatch, f"/api/plex/playlists/{pid}").json()
+        detail = _get(db, user, monkeypatch, override_dep, f"/api/plex/playlists/{pid}").json()
         assert [it["id"] for it in detail["items"]] == ["m2", "m1"]  # reorder applied, in order
 
         # remove m1 -> one item left
-        rm = _request(db, user, monkeypatch, "DELETE", f"/api/plex/playlists/{pid}/items/m1")
+        rm = _request(
+            db, user, monkeypatch, override_dep, "DELETE", f"/api/plex/playlists/{pid}/items/m1"
+        )
         assert rm.status_code == 200, rm.text
-        after = _get(db, user, monkeypatch, f"/api/plex/playlists/{pid}").json()
+        after = _get(db, user, monkeypatch, override_dep, f"/api/plex/playlists/{pid}").json()
         assert [it["id"] for it in after["items"]] == ["m2"]
 
         # delete the playlist -> gone from the list
-        _request(db, user, monkeypatch, "DELETE", f"/api/plex/playlists/{pid}")
-        assert _get(db, user, monkeypatch, "/api/plex/playlists").json()["playlists"] == []
+        _request(db, user, monkeypatch, override_dep, "DELETE", f"/api/plex/playlists/{pid}")
+        assert (
+            _get(db, user, monkeypatch, override_dep, "/api/plex/playlists").json()["playlists"]
+            == []
+        )
 
-    def test_playlist_bulk_add_and_remove(self, db, monkeypatch):
+    def test_playlist_bulk_add_and_remove(self, db, monkeypatch, override_dep):
         # Covers the bulk endpoints (add-bulk / remove-bulk) and pins the remove-bulk delete's
         # synchronize_session=False path, which the single add/remove roundtrip never exercises.
         lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
@@ -402,13 +421,16 @@ class TestPlaylistAndCollectionEndpoints:
         db.add(user)
         db.commit()
 
-        created = _request(db, user, monkeypatch, "POST", "/api/plex/playlists", {"title": "Bulk"})
+        created = _request(
+            db, user, monkeypatch, override_dep, "POST", "/api/plex/playlists", {"title": "Bulk"}
+        )
         pid = created.json()["id"]
 
         added = _request(
             db,
             user,
             monkeypatch,
+            override_dep,
             "POST",
             f"/api/plex/playlists/{pid}/items/bulk",
             {"item_rating_keys": ["m1", "m2", "m3"]},
@@ -420,6 +442,7 @@ class TestPlaylistAndCollectionEndpoints:
             db,
             user,
             monkeypatch,
+            override_dep,
             "POST",
             f"/api/plex/playlists/{pid}/items/remove-bulk",
             {"item_rating_keys": ["m2"]},
@@ -427,13 +450,13 @@ class TestPlaylistAndCollectionEndpoints:
         assert removed.status_code == 200, removed.text
         assert removed.json() == {"removed": 1, "item_count": 2}
 
-        detail = _get(db, user, monkeypatch, f"/api/plex/playlists/{pid}").json()
+        detail = _get(db, user, monkeypatch, override_dep, f"/api/plex/playlists/{pid}").json()
         assert [it["id"] for it in detail["items"]] == [
             "m1",
             "m3",
         ]  # input order preserved, m2 gone
 
-    def test_collections_list(self, db, monkeypatch):
+    def test_collections_list(self, db, monkeypatch, override_dep):
         from app.models import PlexCollection
 
         lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
@@ -450,13 +473,13 @@ class TestPlaylistAndCollectionEndpoints:
         db.commit()
 
         # unified scope (no library param) -> most-populated first
-        body = _get(db, user, monkeypatch, "/api/plex/collections").json()
+        body = _get(db, user, monkeypatch, override_dep, "/api/plex/collections").json()
         assert [c["title"] for c in body["collections"]] == ["Marvel", "Pixar"]
         # name filter
-        filtered = _get(db, user, monkeypatch, "/api/plex/collections?q=pix").json()
+        filtered = _get(db, user, monkeypatch, override_dep, "/api/plex/collections?q=pix").json()
         assert [c["title"] for c in filtered["collections"]] == ["Pixar"]
 
-    def test_item_state_watched_then_new(self, db, monkeypatch):
+    def test_item_state_watched_then_new(self, db, monkeypatch, override_dep):
         # No PlexLink -> the background Plex push is a no-op; only the local PlexState path runs, which
         # is what the conversion touched (the st lookup + the delete on ->new).
         lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
@@ -468,7 +491,13 @@ class TestPlaylistAndCollectionEndpoints:
         db.commit()
 
         watched = _request(
-            db, user, monkeypatch, "POST", "/api/plex/item/m1/state", {"status": "watched"}
+            db,
+            user,
+            monkeypatch,
+            override_dep,
+            "POST",
+            "/api/plex/item/m1/state",
+            {"status": "watched"},
         )
         assert watched.status_code == 200, watched.text
         assert watched.json()["status"] == "watched"
@@ -476,7 +505,15 @@ class TestPlaylistAndCollectionEndpoints:
         assert row.status == "watched"
 
         # -> new deletes the state row
-        back = _request(db, user, monkeypatch, "POST", "/api/plex/item/m1/state", {"status": "new"})
+        back = _request(
+            db,
+            user,
+            monkeypatch,
+            override_dep,
+            "POST",
+            "/api/plex/item/m1/state",
+            {"status": "new"},
+        )
         assert back.status_code == 200, back.text
         assert (
             db.execute(select(PlexState).where(PlexState.user_id == user.id)).scalars().first()
diff --git a/backend/tests/test_saved_views_source.py b/backend/tests/test_saved_views_source.py
index ae8b0f7d..7db013f9 100644
--- a/backend/tests/test_saved_views_source.py
+++ b/backend/tests/test_saved_views_source.py
@@ -11,12 +11,12 @@ from app.main import app
 from app.models import User
 
 
-def _client(db, user, monkeypatch):
+def _client(db, user, monkeypatch, override_dep):
     monkeypatch.setattr(
         state, "_configured_cache", True
     )  # the request gate 503s an unconfigured app
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[current_user] = lambda: user  # require_human resolves through this
+    override_dep(get_db, lambda: db)
+    override_dep(current_user, lambda: user)  # require_human resolves through this
     return TestClient(app)
 
 
@@ -27,56 +27,43 @@ def _user(db):
     return u
 
 
-def test_views_are_scoped_by_source(db, monkeypatch):
+def test_views_are_scoped_by_source(db, monkeypatch, override_dep):
     user = _user(db)
-    try:
-        c = _client(db, user, monkeypatch)
-        # Same NAME under two sources is allowed (unique is per user+source now).
-        f = c.post(
-            "/api/saved-views", json={"name": "Fresh", "filters": {"a": 1}, "source": "feed"}
-        )
-        p = c.post(
-            "/api/saved-views", json={"name": "Fresh", "filters": {"b": 2}, "source": "plex"}
-        )
-        assert f.status_code == 200 and p.status_code == 200, (f.text, p.text)
+    c = _client(db, user, monkeypatch, override_dep)
+    # Same NAME under two sources is allowed (unique is per user+source now).
+    f = c.post("/api/saved-views", json={"name": "Fresh", "filters": {"a": 1}, "source": "feed"})
+    p = c.post("/api/saved-views", json={"name": "Fresh", "filters": {"b": 2}, "source": "plex"})
+    assert f.status_code == 200 and p.status_code == 200, (f.text, p.text)
 
-        feed = c.get("/api/saved-views?source=feed").json()
-        plex = c.get("/api/saved-views?source=plex").json()
-        assert [v["name"] for v in feed] == ["Fresh"]
-        assert [v["name"] for v in plex] == ["Fresh"]
-        assert feed[0]["filters"] == {"a": 1} and plex[0]["filters"] == {"b": 2}
-        # A source-less GET keeps the old feed-only behaviour.
-        assert [v["id"] for v in c.get("/api/saved-views").json()] == [v["id"] for v in feed]
-    finally:
-        app.dependency_overrides.clear()
+    feed = c.get("/api/saved-views?source=feed").json()
+    plex = c.get("/api/saved-views?source=plex").json()
+    assert [v["name"] for v in feed] == ["Fresh"]
+    assert [v["name"] for v in plex] == ["Fresh"]
+    assert feed[0]["filters"] == {"a": 1} and plex[0]["filters"] == {"b": 2}
+    # A source-less GET keeps the old feed-only behaviour.
+    assert [v["id"] for v in c.get("/api/saved-views").json()] == [v["id"] for v in feed]
 
 
-def test_default_is_per_source(db, monkeypatch):
+def test_default_is_per_source(db, monkeypatch, override_dep):
     user = _user(db)
-    try:
-        c = _client(db, user, monkeypatch)
-        fid = c.post(
-            "/api/saved-views", json={"name": "F", "filters": {}, "source": "feed"}
-        ).json()["id"]
-        pid = c.post(
-            "/api/saved-views", json={"name": "P", "filters": {}, "source": "plex"}
-        ).json()["id"]
-        c.patch(f"/api/saved-views/{fid}", json={"is_default": True})
-        c.patch(f"/api/saved-views/{pid}", json={"is_default": True})
-        # Making the Plex view default must NOT clear the feed view's default (different source).
-        assert c.get("/api/saved-views?source=feed").json()[0]["is_default"] is True
-        assert c.get("/api/saved-views?source=plex").json()[0]["is_default"] is True
-    finally:
-        app.dependency_overrides.clear()
+    c = _client(db, user, monkeypatch, override_dep)
+    fid = c.post("/api/saved-views", json={"name": "F", "filters": {}, "source": "feed"}).json()[
+        "id"
+    ]
+    pid = c.post("/api/saved-views", json={"name": "P", "filters": {}, "source": "plex"}).json()[
+        "id"
+    ]
+    c.patch(f"/api/saved-views/{fid}", json={"is_default": True})
+    c.patch(f"/api/saved-views/{pid}", json={"is_default": True})
+    # Making the Plex view default must NOT clear the feed view's default (different source).
+    assert c.get("/api/saved-views?source=feed").json()[0]["is_default"] is True
+    assert c.get("/api/saved-views?source=plex").json()[0]["is_default"] is True
 
 
-def test_duplicate_name_within_a_source_conflicts(db, monkeypatch):
+def test_duplicate_name_within_a_source_conflicts(db, monkeypatch, override_dep):
     user = _user(db)
-    try:
-        c = _client(db, user, monkeypatch)
-        a = c.post("/api/saved-views", json={"name": "Dup", "filters": {}, "source": "plex"})
-        b = c.post("/api/saved-views", json={"name": "Dup", "filters": {}, "source": "plex"})
-        assert a.status_code == 200
-        assert b.status_code == 409  # same (user, source, name)
-    finally:
-        app.dependency_overrides.clear()
+    c = _client(db, user, monkeypatch, override_dep)
+    a = c.post("/api/saved-views", json={"name": "Dup", "filters": {}, "source": "plex"})
+    b = c.post("/api/saved-views", json={"name": "Dup", "filters": {}, "source": "plex"})
+    assert a.status_code == 200
+    assert b.status_code == 409  # same (user, source, name)
diff --git a/backend/tests/test_search_scrape_ingest.py b/backend/tests/test_search_scrape_ingest.py
index 5ab47a07..e4f30a43 100644
--- a/backend/tests/test_search_scrape_ingest.py
+++ b/backend/tests/test_search_scrape_ingest.py
@@ -96,7 +96,7 @@ def test_scrape_ingest_enrich_miss_keeps_nonnull_placeholder(db):
     assert c.enriched_at is None
 
 
-def test_search_youtube_route_returns_422_when_ingest_fails(db, monkeypatch):
+def test_search_youtube_route_returns_422_when_ingest_fails(db, monkeypatch, override_dep):
     # Route-level guard (B-core-1): an ingest failure with nothing yet collected must surface as a 422
     # + message on this JSON endpoint (the FE hides 5xx behind a generic "connection lost" + auto-retry,
     # burning a second quota-costed search), and the session is rolled back. Here the page fetch succeeds
@@ -145,12 +145,9 @@ def test_search_youtube_route_returns_422_when_ingest_fails(db, monkeypatch):
 
     monkeypatch.setattr(search_mod, "_ingest_candidates", _boom)
 
-    app.dependency_overrides[get_db] = lambda: db
-    app.dependency_overrides[require_human] = lambda: user
-    try:
-        resp = TestClient(app).get("/api/search/youtube?q=test+term")
-    finally:
-        app.dependency_overrides.clear()
+    override_dep(get_db, lambda: db)
+    override_dep(require_human, lambda: user)
+    resp = TestClient(app).get("/api/search/youtube?q=test+term")
 
     assert resp.status_code == 422, resp.text
     assert resp.json()["detail"] == {"code": "youtube", "reason": "unavailable"}