feat(music-lab): market_trends·trend_reports DB + market.py + /api/music/market 5개 API

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

music-lab/tests/test_market.py

@@ -0,0 +1,37 @@
+# music-lab/tests/test_market.py
+
+def test_ingest_and_report(tmp_db):
+    from app.db import init_db
+    from app.market import ingest_trends, get_suggestions
+    init_db()
+
+    trends = [
+        {"source": "youtube",    "country": "BR", "genre": "lo-fi", "keyword": "lofi study", "score": 0.9, "rank": 1, "metadata": {}},
+        {"source": "youtube",    "country": "ID", "genre": "pop",   "keyword": "pop hits",   "score": 0.7, "rank": 2, "metadata": {}},
+        {"source": "billboard",  "country": "US", "genre": "pop",   "keyword": "top 40",     "score": 0.8, "rank": 1, "metadata": {}},
+    ]
+    report = ingest_trends(trends, "2026-05-01")
+    assert report["report_date"] == "2026-05-01"
+    assert len(report["top_genres"]) >= 2
+    # pop이 lo-fi보다 score 높아야 함 (2건)
+    genres_by_score = [g["genre"] for g in report["top_genres"]]
+    assert genres_by_score[0] == "pop"
+
+    suggestions = get_suggestions(limit=3)
+    assert len(suggestions) >= 1
+    assert "suno_prompt" in suggestions[0]
+
+
+def test_ingest_idempotent(tmp_db):
+    """같은 날 두 번 ingest해도 report가 upsert 돼야 함."""
+    from app.db import init_db, get_trend_reports
+    from app.market import ingest_trends
+    init_db()
+
+    trends = [{"source": "youtube", "country": "BR", "genre": "lo-fi",
+               "keyword": "chill", "score": 0.8, "rank": 1, "metadata": {}}]
+    ingest_trends(trends, "2026-05-01")
+    ingest_trends(trends, "2026-05-01")   # 두 번째
+
+    reports = get_trend_reports()
+    assert len([r for r in reports if r["report_date"] == "2026-05-01"]) == 1