Edit: suggested topics appear to have am answer that didn't come up in a search earlier.
I had to restore a VM running Node-Red, and it has an old version of my flows.
Upon trying to import the current version of flows, I get the option to not import or import copies. There are hundreds of flows and dashboard elements, so copies would be a very bad thing...
How can I import the JSON text and have it replace everything that's a duplicate?