The SI Archive directory contains a file named initGui.jar. Double click on it (if it doesn't start, open a command window in the SI directory and type java -jar initGui.jar), click on Next>> and once more on Finish(x), you are done.
Start SI Archive as usual.

SI Archive has been designed to theoretically work with any SQL database. It reads the file datasource.properties from the program directory or the user home directory to determine the connection properties. The properties
database.Library
database.Driver
database.URL
user
password
must be defined.
If no external DB is available the embedded SQLite DB can be used. This is the default. In that case the additional property database.path can be set to define the path of the database on disk, e.g. in Home directory (${user.home}), program directory (${user.dir}), some subdirectory thereof or any other directory. The default is ${user.home}/siarchive.db.
Driver and sample configuration for an external PostgreSQL database is included with SI Archive as well.

To use the database, first the needed tables must be created. There are prepared scripts for SQLite and PostgreSQL databases in the sql subdirectory.
To use your own external DB you need to provide an own initialization script as well as the JDBC driver to connect to the database. The path to the driver must be entered into database.Library in datasource.properties.
When eveything is thus prepared, the DB can be initialized with

java -jar init.jar sql/<script>.sql

or, much more comfortably, with a double click on initGui.jar or with

java -jar initGui.jar

In its upper part initGui.jar displays the used datasource.properties file an (the same one is used by SI Archive as well) and, below that, the defined properties.
In the lower part you must select a suitable SQL initialization script. After all is ready a click on Next>> starts the initialization.
The result is displayed on the next page. A click on Finish(x) closes the program.
SI Archive is now initialized an can be used as usual.