allow ajust sentences

sentence_api/tests/test_api.py

@@ -259,3 +259,72 @@ def test_admin_can_split_sentence_and_reindexes_following_sentences(tmp_path):
         "Next sentence.",
     ]
     assert [item.index for item in document.sentences] == [0, 1, 2]
+
+
+def test_admin_boundary_adjustment_updates_linked_next_start(tmp_path):
+    settings = replace(Settings.from_env(), data_dir=tmp_path / "data")
+    settings.ensure_directories()
+    repository = VideoRepository(settings.database_path)
+    repository.upsert_upload(
+        video_hash=VIDEO_HASH,
+        title="Boundary lesson",
+        filename="lesson.mp4",
+        stored_filename=f"{VIDEO_HASH}.mp4",
+        content_type="video/mp4",
+        size_bytes=5,
+        language="en",
+    )
+    repository.save_processing_result(
+        SentenceBoundaryDocument(
+            video_hash=VIDEO_HASH,
+            duration_ms=9000,
+            algorithm_version="test",
+            sentences=[
+                SentenceBoundary(
+                    index=0,
+                    start_ms=0,
+                    end_ms=4000,
+                    text="First.",
+                    language="en",
+                    reference_speech_duration_ms=3600,
+                ),
+                SentenceBoundary(
+                    index=1,
+                    start_ms=4000,
+                    end_ms=9000,
+                    text="Second.",
+                    language="en",
+                    reference_speech_duration_ms=4600,
+                ),
+            ],
+        ),
+        None,
+    )
+
+    class UnavailableTranscriber:
+        available = False
+
+    client = TestClient(
+        create_app(
+            BoundaryStore(tmp_path / "boundaries.json"),
+            settings=settings,
+            repository=repository,
+            transcriber=UnavailableTranscriber(),
+        )
+    )
+    response = client.put(
+        f"/api/v1/admin/videos/{VIDEO_HASH}/sentences/0/boundary",
+        json={"delta_ms": 250},
+    )
+
+    assert response.status_code == 200
+    updated = response.json()
+    assert [item["index"] for item in updated] == [0, 1]
+    assert updated[0]["end_ms"] == 4250
+    assert updated[1]["start_ms"] == 4250
+    assert updated[0]["reference_speech_duration_ms"] == 3850
+    assert updated[1]["reference_speech_duration_ms"] == 4350
+
+    document = repository.get_document(VIDEO_HASH)
+    assert [item.end_ms for item in document.sentences] == [4250, 9000]
+    assert [item.start_ms for item in document.sentences] == [0, 4250]