Flows and dashboards get ids: the store is addressed by id with a key index, the first start gives every document its key as id, fluksio store migrate --dry-run and ls; the rename routes are gone

docs/code/cli.md

@@ -130,6 +130,21 @@ FLUKSIO_WORKER_TOKEN=your-token fluksio worker \
 Create the worker token on the engine first. See [Remote workers](workers.md)
 for token creation, interpreter selection and labels.
 
+## `fluksio store`
+
+```sh
+fluksio store ls ~/.fluksio/flows
+fluksio store migrate --dry-run ./flows-copy
+```
+
+Both read a flow store directory and change nothing. `ls` lists its flows and
+dashboards by id, key and kind, which helps when reading a backup.
+
+`migrate --dry-run` runs the check the engine makes when it starts and prints
+what the start would migrate, or why it would refuse to start. It exits with 1
+on a refusal. Point it at a copy of the store. The engine migrates the store
+itself, on its next start.
+
 ## Talking to an engine
 
 Client commands use the nearest `.fluksio/client.json`, or the global