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storage/docs/architecture/decisions/031-moduletodbschema-for-updates.md
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2026-05-29 07:19:03 +00:00

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ADR-031: moduleToDbSchema() for schema updates, not Value.Patch

Status

Accepted

Context

When a graph type Module changes, the stored schema in node_types.schema must be updated. This could be done by patching the stored schema with Value.Patch or by re-running moduleToDbSchema() on the full Module.

Decision

Re-run moduleToDbSchema() on the updated Module. Patch-based schema update (Value.Patch) is unreliable for Type.Ref/$defs changes — the diff is structural, not semantic, and may not capture $defs reorganization correctly. moduleToDbSchema() is more reliable because it always produces a fresh, complete projection.

Patch-based schema update is an optimization for later.

Consequences

  • Schema updates always go through moduleToDbSchema()
  • The full Module must be available at migration time
  • No risk of partial/partially-correct patches from Value.Diff
  • Patch-based update can be added as an optimization if needed

References