MigrateDatabaseIfNeeded has all the logic necessary to migrate from an old database through an arbitrary number of versions to the current database version.

NewDatabase creates a new database object in memory and creates the directory and files on disk for storing the data location is the base directory for creating the database.

FossilDBVersion is the version of the database as recorded on disk.

An Entry is a hydrated Datum, where the time and topic have been expanded.

The Query object represents a single query on a database.

Result wraps a slice of Items.

A Filter that takes a list of Datum and returns a filtered list of Datum.