Snapshots

A snapshot is a versioned JSON capture of the source instance: SQL schema, enabled modules, extrafields, and integration metadata. It is not a full database dump.

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Typical contents

• Table/column/index inventory
• Custom modules and declared versions
• Extrafields and FK links
• Integrity probes (orphans, malformed JSON)

Reference snapshots

For the target version, Knot Migration downloads a signed snapshot from license.knot.tools. The Ed25519 signature is verified before any comparison.

Crypto rule

No valid signature → no analysis. No degraded mode bypasses this rule.

Cache and TTL

Reference snapshots are cached under documents/knotmigration/. An expired snapshot triggers a degraded modes banner and blocks new analyses until refresh.

Lifecycle

1. Local generation during the diagnostic
2. Comparison with the target reference
3. Archival for history and later dry-run runs

Next

Analyses From snapshot to report.