change(aliby): warn->debug time conversion except

src/agora/io/signal.py

@@ -84,7 +84,7 @@ class Signal(BridgeH5):
         try:
             df.columns = (df.columns * self.tinterval // 60).astype(int)
         except Exception as e:
-            self._log(f"Unable to convert columns to minutes: {e}")
+            self._log(f"Unable to convert columns to minutes: {e}", "debug")
         return df
 
     @cached_property