Save QSO data to a file

[seporaitis]

There are a couple of format options here:

• Cabrillo - seems to be oriented towards contests and highly customizable.
• Amateur Data Interchange Format (ADIF) - seems to cover A LOT of scenarios and is more general purpose.

However, ADIF has a lot of https://adif.org/309/ADIF_309.htm#Enumerations that, in case I decide to, say, allow import-and-use-of existing ADIF logs, would just blow up scope for me.

Since I do not have enough experience with qso loggers at all, I am not yet certain ADIF is the de-facto standard for storing logs, as opposed to just using it as data interchange format (e.g. I export it from one app to import to another). From my experience in general software engineering parsing XML file of a significant size 10-100Mb would increase app bootstrap time, even if I need only the final few records to show in the interface.

Hence, I am leaning towards SQLite or similar(?). It has the benefits:

• popular and stable format that has a lot of tools to inspect its contents
• is a library and not another software package/service to install and handle (e.g. MySQL/MariaDB/PostgreSQL)
• would simplify some tasks (e.g. "get me 10 most recent records" to show in the UI)

Some potential caveats:

• SQLite does not support concurrent writes
• managing schema changes

[seporaitis]

Autoconf extension for SQLite3 check can be found here.