Update app.py

app.py

@@ -896,4 +896,25 @@ def append_and_retrain(payload: dict):
     # Retrain model on full updated DB
     retrain_model()
 
-    return {"ok": True, "message": "Fingerprint appended and model retrained"}
+    return {"ok": True, "message": "Fingerprint appended and model retrained"}
+
+
+@app.get("/debug/db_head")
+def debug_db_head(n: int = 5):
+    import os
+    import pandas as pd
+
+    if not os.path.exists(FINGERPRINT_CSV):
+        return {
+            "exists": False,
+            "message": f"{FINGERPRINT_CSV} not found in current working dir."
+        }
+
+    df = pd.read_csv(FINGERPRINT_CSV)
+    return {
+        "exists": True,
+        "file": FINGERPRINT_CSV,
+        "rows": int(len(df)),
+        "head": df.head(n).to_dict(orient="records"),
+        "columns": list(df.columns),
+    }