* can put in dumb dates - DO SOME INPUT VALIDATION, *sigh*
    - e.g. 0026-02-19 for a Gas bill

* kayo bills are wrong in between normal bills

* added an electricity bill by accident for 2018, that kills lots :(
    - something to do with missing year of data in quarterly bills - still an issue

* if change a bill (like Amazon), then its future estimates don't update