# Atomic keyed changefeed snapshot materializer

Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment.

Fold supplied ordered revision-checked put/delete events into a fresh complete keyed snapshot with tombstones and receipts, or return the first tentative-fold conflict without partial state. Valid conflicts are normal paid results; never reads or writes a database.

Release: 0.29.0. Built: 2026-10-06T15:38:00Z.

## Choose for
- Preparing a complete next snapshot from caller-supplied records and events
- Keeping exact typed tuple identity and explicit revision arithmetic
- Inspecting an offline ordered event fold before separately authorized persistence

## Outside this profile
- Live CDC ingestion, database CAS or transactions, cursor advancement or durable writes
- Historical event deduplication, exactly-once execution or authenticated event provenance
- Partial record patches, last-writer-wins, tombstone garbage collection or CRDT convergence
- Fetching sources, changing external state or executing supplied data

Proposed nominal USD 0.006 per successful call; payer fees excluded. No verified runtime availability.

- [Exact release contract](/reference/services/keyed-changefeed-materialize.json)
- [Input schema](/reference/schemas/keyed-changefeed-materialize.input.json)
- [Output schema](/reference/schemas/keyed-changefeed-materialize.output.json)
- [Fixed example](/reference/examples/keyed-changefeed-materialize.json)
- [Complete HTML reference](/discover/tools/keyed-changefeed-materialize)