Graph history

Every non-empty save copies the previous on-disk graph into ~/.config/threadle/graphs/versions/<id>/. Cap is 30 snapshots per graph (oldest pruned). Empty graphs are never written to disk and do not create versions.

Undo vs history

	In-session undo	Version history
Lifetime	Current editor tab	On disk under config dir
Trigger	Structural edits (debounced)	Each successful save of a non-empty graph
Restore	Cmd+Z / redo stack	Topbar versions menu → pick a stamp

Restore writes through the normal save path, so the state you leave behind is itself snapshotted first.

UI

In the workflow editor topbar, open versions (⟲). The list shows timestamp, name, and node count. Click a row to restore.

API

Method	Path	Body / notes
GET	/api/graphs/:id/versions	Summary list (ts, updatedAt, name, nodeCount)
GET	/api/graphs/:id/versions/:ts	Full graph JSON for that stamp
POST	/api/graphs/:id/restore	{ "ts": "<stamp>" } → restored graph

Related

• Graph & wires
• Files & config
• Backup. Full machine archive (includes current graphs, not every version file by default)