Consider “New frecency algorithm” to implement

[delphinus]

Now this plugin uses old frecency algorithm. There is newly improved logic, so we may upgrade into this.

User:Jesse/NewFrecency - MozillaWiki

[delphinus]

Now I've released 1.1.0 that has “v2” version of database. You can test it with db_version = "v2" in setup {}.

[delphinus]

This issue will be closed when 2.0.0 is released and deprecated “v1” database is removed.