As of version 1.2.8, logback no longer ships with DBAppender.
The logback-db project remedies this omission by providing DBAppender for logback-classic and logback-access.
More specifically, the logback-classic-db module contains DBAppender for logback-classic wheread the logback-acess-db module contains DBAppender for logback-access. Both modules require logback-code-db module as a prerequisite.
Here are the Maven coordiates for the aforementioned components:
ch.qos.logback.db:logback-core-db:VERSION
ch.qos.logback.db:logback-classic-db:VERSION
ch.qos.logback.db:logback-access-db:VERSION
As of 2022-04-20, 1.2.11.1 was the latest release version.
See also https://logback.qos.ch/news.html for the latest available release version.