a long overdue migration has finally been done. here are some notes to remember

• for data export you need the opml file and the actual data dump
• opml export via web interface
• data dump via data_migration plugin
  • as the user owning ttrss, in the subfolder > plugins.local do git clone https://gitlab.tt-rss.org/tt-rss/plugins/ttrss-data-migration.git data_migration
  • add this to the host config file to allow the plugin: putenv('TTRSS_PLUGINS=auth_internal, data_migration');
  • then run `./update.php –data_user YOUR_TTRSS_USER –data_export FILENAME.zip
• set up new ttrss docker instance as you prefer
• first run with the updater container commented out
• import opml on web ui
• import data dump in container
  • docker exec -it your_cointainer /bin/sh
  • in /var/www/html/ttrss run as user app: `./update.php –data_user YOUR_TTRSS_USER –data_import FILENAME.zip
• ideally do this in a tmux session in case your connection dies