I'm quite new to magento development and could not find any information on this theme.
I know that the
catalog_product_flat* tables are indexed and are only existing, if magento is set to use flat tables. Therefore data stored here might get deleted and the tables could get recreated with data from other tables.
Is the same true for the
sales_flat* tables? I'm writing a module and I'm storing data in these tables. If they could get dropped and then reconstructed by magento i would loose this data. Is it safe to store data only in these tables? Or should i use other tables and then populate the data in sales_flat* with these?
For example i would like to store the payment date if an invoice in
sales_flat_invoice_grid. Because the german tax office needs these dates instead of the date the invoice was issued.