Change data capture

CDC in Skipprd is not a dump of the source log. Supported paths carry enough order and deletion information to converge on the table as it should be in the destination.

Sources declare a CDC mode in their execution contract:

Mode	Behaviour
snapshot	Bounded snapshot only. No CDC stream.
snapshot_then_cdc	Snapshot, checkpoint, then native CDC. Later runs resume and skip the snapshot.
cdc_only	Native CDC stream only.

Ingest treats CDC batches as first-class. Position (for example a Postgres LSN) is part of resume state. The WAL is still the durable boundary: a change is real once it is committed there, then compacted into the sink with a stable compaction_id.

Next

• Guarantees — order tokens, tombstones, reconciliation
• Exactly-once
• PostgreSQL source