fix: scan backfills release type metadata onto pre-existing rows

MonitoredRelease rows created before an artist's discography was
populated (e.g. an owned album recorded before _populate_discography
ran) never got primaryType/secondaryTypes backfilled, wrongly
excluding them from the studio-only core view. _populate_discography
now DO UPDATEs the MB type metadata on conflict instead of DO NOTHING,
leaving monitored/state/currentQualityClass/firstGrabbedAt untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

worker/tests/test_scan.py

@@ -142,3 +142,29 @@ def test_scan_populates_full_discography_unmonitored(conn, tmp_path):
         assert cur.fetchone() == (True, "fulfilled")  # owned album stays monitored+fulfilled
         cur.execute('SELECT monitored, state FROM "MonitoredRelease" WHERE "rgMbid"=%s', ("rg-other",))
         assert cur.fetchone() == (False, "wanted")  # the rest are unmonitored
+
+
+def test_scan_backfills_type_on_preexisting_typeless_owned_row(conn, tmp_path):
+    from lyra_worker.adapters.fakes import FakeMbBrowser
+    from lyra_worker.browser import ReleaseGroupInfo
+    # simulate an owned row recorded by an older scan: monitored+fulfilled but NULL primaryType
+    with conn.cursor() as cur:
+        cur.execute(
+            'INSERT INTO "MonitoredRelease" (id, "artistMbid", "artistName", "rgMbid", album, '
+            '"secondaryTypes", monitored, state, "currentQualityClass", "createdAt") '
+            "VALUES (gen_random_uuid()::text, 'a50', '50 Cent', 'rg-owned', 'Get Rich or Die Tryin''', "
+            "'{}', true, 'fulfilled', 2, now())"
+        )
+    conn.commit()
+    _album(tmp_path, "50 Cent", "Get Rich or Die Tryin' (2003)")
+    resolver = FakeResolver({
+        ("50 Cent", "Get Rich or Die Tryin'"): MBTarget(
+            artist="50 Cent", album="Get Rich or Die Tryin'", year=2003, rg_mbid="rg-owned", artist_mbid="a50"),
+    })
+    browser = FakeMbBrowser(releases={"a50": [
+        ReleaseGroupInfo("rg-owned", "Get Rich or Die Tryin'", "Album", (), "2003-02-06"),
+    ]})
+    scan_library(conn, resolver, FakeProbe(quality_class=2), browser, dest_root=str(tmp_path))
+    with conn.cursor() as cur:
+        cur.execute('SELECT "primaryType", monitored, state, "currentQualityClass" FROM "MonitoredRelease" WHERE "rgMbid"=%s', ("rg-owned",))
+        assert cur.fetchone() == ("Album", True, "fulfilled", 2)  # type backfilled, state preserved