matrix-docker-ansible-deploy/docs/importing-sqlite.md

Importing an existing SQLite database from another installation (optional)

Run this if you'd like to import your database from a previous default installation of Matrix Synapse. (don't forget to import your media_store files as well - see below).

While this playbook always sets up PostgreSQL, by default a Matrix Synapse installation would run using an SQLite database.

If you have such a Matrix Synapse setup and wish to migrate it here (and over to PostgreSQL), this command is for you.

Run this command (make sure to replace <local-path-to-homeserver.db> with a file path on your local machine):

ansible-playbook -i inventory/hosts setup.yml --extra-vars='local_path_homeserver_db=<local-path-to-homeserver.db>' --tags=import-sqlite-db

Note: <local-path-to-homeserver.db> must be a file path to a homeserver.db file on your local machine (not on the server!). This file is copied to the server and imported.