Merge pull request #6469 from matrix-org/erikj/make_database_class

changelog.d/6469.misc

scripts-dev/update_database

scripts/synapse_port_db

synapse/app/_base.py

synapse/app/homeserver.py

synapse/app/user_dir.py

synapse/module_api/__init__.py

synapse/rest/media/v1/preview_url_resource.py

synapse/storage/__init__.py

synapse/storage/_base.py

synapse/storage/background_updates.py

synapse/storage/data_stores/main/__init__.py

synapse/storage/data_stores/main/account_data.py

synapse/storage/data_stores/main/appservice.py

synapse/storage/data_stores/main/cache.py

synapse/storage/data_stores/main/client_ips.py

synapse/storage/data_stores/main/deviceinbox.py

synapse/storage/data_stores/main/devices.py

synapse/storage/data_stores/main/directory.py

synapse/storage/data_stores/main/e2e_room_keys.py