ondics/ckan-n8n-workflows ? reverse-engineered prompt

Build me a small collection of n8n workflows for CKAN that I can import and use right away.

I want one workflow that sets up the standard DCAT AP DE categories in CKAN, skips anything that already exists, and can also remove them again if needed. I want a second workflow that checks PEGELONLINE every 10 minutes, takes the water level values for several configurable measuring stations, and writes them into a CKAN datastore resource, only inserting new values or updating changed ones. I also want a third workflow that checks CKAN datasets for content that has not been updated in a long time and sends reminder emails to admins or dataset contacts, with a test mode and a real send mode.

Please make the workflows easy to configure with a central place for URLs, resource IDs, email addresses, and measuring stations. Use environment variables for the CKAN connection and keep the workflows well documented so they are easy to adjust after import. If you need current details for CKAN or n8n nodes, look up the latest docs online.