I wrote:
> I got this error message:
>
> Loading articles from cache...Error while loading feeds from database: database or disk is full
>
> Probably my disk was full, but after making some space for cache.db, the error persists.
> Is the database full? (What limits exist?)
> What can I do?
It turned out that not the partition containing my cache.db, but the OS partition was the problem.
Sorry for the noise.