[Improvement] Тhe chart for precious metal prices

[NEKolev]

I'm just throwing out a few ideas:

1. Add the price at the time of purchase as well — "Price then, €"
2. Change "Price, €" to "Price now, €"
3. If possible, add the number of coins
4. If possible, make the information tooltip stay visible longer
5. If possible, years with no purchases should not be displayed

7. For years with no purchases/sales, some parasitic (incorrect/ghost) values appear

[NEKolev]

If the values ​​can be grouped. It's much more convenient to read. And respect the separator, a semicolon or comma.
For example:
1500.09 becomes 1 500,09

It is best to take into account the regional settings in the operating system.