The addedAt field records the moment an artifact was placed into a particular lab batch, captured automatically when the ArtifactLabBatch link is created. Because an artifact can move through several batches over its post-excavation processing, this timestamp lets you trace exactly when a find entered each stage of lab work — useful for tracking turnaround, ordering events, and accounting for where material was at any point. Every membership row carries an addedAt, since it defaults to the time the link is made.
Technical section
Data model, API, and internals — visible to developers.