Machine Data Artifact

The machine_data_artifact entry stores every placed machine instance — position, owner, inventory, energy charge and processing progress — as JSON. Point each machine_definition's storageRef at one.

Field	Default	Description
artifactId	machine-data	Unique artifact identifier. Do not change after creation or stored instances are lost.

Instances are saved on shutdown and restored after the definitions are published at startup, so machines resume exactly where they stopped.