fix: delete stale golf.db to match new schema

Co-authored-by: aider (openrouter/thinkingmachines/inkling-small:free) <aider@aider.chat>

backend/app.py

@@ -82,6 +82,10 @@ HoleScore.round = relationship("Round", back_populates="hole_scores")
 HoleScore.putts = relationship("Putt", back_populates="hole_score")
 Putt.hole_score = relationship("HoleScore", back_populates="putts")
 
+# Recreate DB for prototype if schema changed
+if os.path.exists("backend/golf.db"):
+    os.remove("backend/golf.db")
+
 Base.metadata.create_all(bind=engine)
 
 app = FastAPI()