Glossary
Tombstone
A tombstone is a record in a delta snapshot saying that a previously delivered record has been withdrawn and must be deleted by every licensee.
Upstream sources withdraw documents: courts remove judgments for personal-data reasons, gazettes take down erroneous publications. Arieta Data reads withdrawals from the LexAPI source of truth (national_withdrawals) and ships them as tombstones in the next monthly delta.
The Arieta Data licence obliges buyers to delete tombstoned records from their copies of the dataset. Models already trained are addressed in the licence schedule; raw records may not be kept.
Sources
Related terms
Delta snapshot
A delta snapshot contains only what changed since the previous snapshot: new and updated records (upserts) and withdrawn records (tombstones).
Content hash
A content hash is a SHA-256 digest of a document’s normalised parsed text; Arieta Data records a new version whenever the hash changes.
Snapshot
An Arieta Data snapshot is a complete, immutable monthly cut of every SKU, identified YYYY-MM and shipped with a manifest of counts and SHA-256 checksums per shard.
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