fix(music-lab): revenue avg_rpm 공식 수정 + UNIQUE 제약 + 테스트 보강

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

music-lab/tests/test_db_video.py

@@ -1,3 +1,6 @@
+import pytest
+
+
 def test_create_and_get_video_project(tmp_db):
     from app.db import init_db, create_video_project, get_video_project
     init_db()
@@ -62,7 +65,6 @@ def test_create_revenue_record(tmp_db):
 
 def test_revenue_dashboard(tmp_db):
     from app.db import init_db, create_revenue_record, get_revenue_dashboard
-    import pytest
     init_db()
     create_revenue_record({"yt_video_id": "v1", "record_month": "2026-04", "views": 5000, "revenue_usd": 10.0})
     create_revenue_record({"yt_video_id": "v2", "record_month": "2026-04", "views": 5000, "revenue_usd": 15.0})
@@ -70,3 +72,54 @@ def test_revenue_dashboard(tmp_db):
     assert dash["total_revenue_usd"] == pytest.approx(25.0)
     assert dash["total_views"] == 10000
     assert len(dash["by_month"]) == 1
+
+
+def test_create_revenue_record_zero_views(tmp_db):
+    from app.db import init_db, create_revenue_record
+    init_db()
+    rec = create_revenue_record({
+        "yt_video_id": "zero",
+        "record_month": "2026-04",
+        "views": 0,
+        "revenue_usd": 0.0,
+    })
+    assert rec["rpm_usd"] == 0.0
+
+
+def test_update_revenue_record(tmp_db):
+    from app.db import init_db, create_revenue_record, update_revenue_record
+    init_db()
+    create_revenue_record({"yt_video_id": "x", "record_month": "2026-04", "views": 1000, "revenue_usd": 5.0})
+    updated = update_revenue_record(1, {"views": 2000, "revenue_usd": 8.0})
+    assert updated["rpm_usd"] == pytest.approx(4.0)
+    assert update_revenue_record(999, {}) is None
+
+
+def test_delete_revenue_record(tmp_db):
+    from app.db import init_db, create_revenue_record, delete_revenue_record, get_all_revenue_records
+    init_db()
+    create_revenue_record({"yt_video_id": "del", "record_month": "2026-04", "views": 100, "revenue_usd": 1.0})
+    assert delete_revenue_record(1) is True
+    assert delete_revenue_record(99) is False
+    assert get_all_revenue_records(yt_video_id="del") == []
+
+
+def test_video_project_status_failed(tmp_db):
+    from app.db import init_db, create_video_project, update_video_project_status, get_video_project
+    init_db()
+    create_video_project({"track_id": 1, "format": "visualizer"})
+    update_video_project_status(1, "failed", error="FFmpeg error")
+    proj = get_video_project(1)
+    assert proj["status"] == "failed"
+    assert proj["completed_at"] is not None
+    assert proj["error"] == "FFmpeg error"
+
+
+def test_video_project_status_rendering_no_completed_at(tmp_db):
+    from app.db import init_db, create_video_project, update_video_project_status, get_video_project
+    init_db()
+    create_video_project({"track_id": 1, "format": "visualizer"})
+    update_video_project_status(1, "rendering")
+    proj = get_video_project(1)
+    assert proj["status"] == "rendering"
+    assert proj["completed_at"] is None