Implement persistent queue engine Refs #6

tests/test_state.py

@@ -11,3 +11,37 @@ def test_delete_queue_items_by_state_can_target_reason(tmp_path):
     rows = state.list_queue_items()
     assert len(rows) == 1
     assert rows[0]["source_id"] == "other"
+
+
+def test_upsert_preserves_terminal_state_by_default(tmp_path):
+    state = State(tmp_path / "state.db")
+    state.upsert_queue_item(source_type="manual", source_id="a", name="A.mkv", state="failed", reason="boom")
+
+    updated = state.upsert_queue_item(source_type="manual", source_id="a", name="A.mkv", state="ready", reason="rescanned")
+
+    assert updated["state"] == "failed"
+    assert updated["reason"] == "boom"
+
+
+def test_claim_next_queue_item_marks_importing(tmp_path):
+    state = State(tmp_path / "state.db")
+    state.upsert_queue_item(source_type="manual", source_id="a", name="A.mkv", state="ready")
+
+    row = state.claim_next_queue_item("worker-1")
+
+    assert row is not None
+    assert row["state"] == "importing"
+    assert row["claimed_by"] == "worker-1"
+
+
+def test_release_stale_claims_requeues_importing_items(tmp_path):
+    state = State(tmp_path / "state.db")
+    state.upsert_queue_item(source_type="manual", source_id="a", name="A.mkv", state="ready")
+    state.claim_next_queue_item("worker-1")
+
+    released = state.release_stale_claims("worker-1")
+    row = state.get_queue_item(1)
+
+    assert released == 1
+    assert row["state"] == "retrying"
+    assert row["claimed_by"] is None