Hi,
This is an awesome project! The way it is so easy to use makes it much more appealing than many other alternatives.
Would it be possible to add Norwegian callsigns to the database? This site is in Norwegian, but at the bottom is a link to a csv file with all current callsigns. It does not have the home grid locator, but it does have the address. This can be used to find the grid in many ways, e.g. something like this.
I think this could be a reasonable extension to the database.