Great, the only bit missing is the ```schema-revision``` in the data_bag json / schema files, i.e. like this:
```json
"ceilometer": {
   "crowbar-revision": 0,
   "schema-revision": 1,
   ...
}```

And in the schema:

```json
"deployment": {
   ....
   "mapping": {
    "schema-revision": { "type": "int", "required": true},
  }
}```
```