chore: add debug script

debug_dmb_deadco.py

@@ -0,0 +1,22 @@
+from sqlmodel import Session, select
+from database import engine
+from models import Vertical, Song, Performance
+
+with Session(engine) as session:
+    for s in ['dmb', 'dead-and-company']:
+        v = session.exec(select(Vertical).where(Vertical.slug == s)).first()
+        print(f"--- {s} ---")
+        if not v:
+            print("Vertical missing")
+            continue
+        print(f"Vertical ID: {v.id}")
+        
+        perfs = session.exec(select(Performance).join(Song).where(Song.vertical_id == v.id)).all()
+        print(f"Total Perfs: {len(perfs)}")
+        
+        song = session.exec(select(Song).where(Song.title == 'All Along the Watchtower', Song.vertical_id == v.id)).first()
+        if song:
+            watchtower_perfs = session.exec(select(Performance).where(Performance.song_id == song.id)).all()
+            print(f"Watchtower: ID={song.id}, Canon={song.canon_id}, Perfs={len(watchtower_perfs)}")
+        else:
+            print("Watchtower: Missing")