Unique instance values are hydrated at create time. The following actions will cause instance values to be populated:
When new data is created from one of these actions, the keys defined in your
_instance_values will be replaced with your choice of the predefined values below:
Generates a uuidv4, useful to indentify each unique item. e.g.
6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b. This is extremely unlikely to generate duplicates and can be considered a unique identifier.