Pin

versions names the reading point exactly, per mirror table, for a reader going back to a state it has read before. A stamp is resolved to a version each time, and a later writer can put another version under a stamp that was already read — a resync stamps what it scanned with the LSN it read BEFORE scanning — so the same txn can come back as other rows. A version cannot. txn stays: it gates the read on the watermark, and it resolves a table versions does not name. What a bookmark is to every log reader — Kafka's offset, Iceberg's snapshot id, Delta's versionAsOf beside timestampAsOf.

txn objectrequired

anyOf

• integer
• object

integer

versions object

anyOf

• object
• null

object

Pin

{
  "txn": 0,
  "versions": {}
}