com.tituslegaldesign.immigration.sourceSnapshot

A point-in-time capture of an upstream source publication: ICE's participating-agencies workbook, a FOIA production, or a roster PDF. Agreement events reference the snapshot that justified them, so every published change traces back to an archived, content-addressed copy of the document it came from. Record key is a TID. Snapshots are never updated or deleted; a revised upstream file is a new snapshot.