Hi @jeandeaux
Both of those messages come from the editor’s autosave and checksum path rather than from the Postgres node itself. 2.32.0 shipped two fixes for the editor checksum going stale while a workflow is open, which is what raises the “changed by someone else” prompt, and 2.33.0 fixed an autosave failure loop. You’re on 2.31.7, so pull the current stable image and restart the container:
docker pull docker.n8n.io/n8nio/n8n
If a single workflow still refuses to save after that, the problem sits in that workflow’s JSON rather than in the instance: