Enhance data processing and utility functions #21
+23
−8
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process_price_changeto accept an optionalasset_idparameter for better asset validation.process_datato ensurejson_datasis always a list and to passasset_idwhen available.update_marketsto ensure the 'multiplier' column exists and fill NaN values with empty strings.get_buy_sell_amountto userow.get()for safer access.Fixes #20