FTB-C000730 / Implementation concept

Append-only log

An append-only log accepts new records while preserving its previously accepted records under a defined writer policy.

Also known asappend-only history

Intermediate 6 linked topicsEvidence-reviewed

Definitions

In plain terms

Corrections become later linked records so readers can still inspect the original history.

Technical

D30 separates runtime append rights, current object grants, future function defaults and the privileged owner's ability to alter controls.

Scope

Append-only is an actor/control guarantee, not an assertion of absolute physical immutability.

Examples

  • A synthetic runtime writer can add a fee journal but cannot update its accepted predecessor.

Common misconceptions

  • A trigger alone does not prevent its owner from removing that trigger.

Concept relationships

Related

Required by

Where this concept is used

Evidence and governance

  1. Event Sourcing pattern Microsoft Azure Architecture Center · first party technical publication

    Supports: preferred label, short definition, variant distinction

    Limits: The pattern does not itself guarantee serial execution, complete evidence or durable financial posting.

  2. PostgreSQL 18: ALTER DEFAULT PRIVILEGES PostgreSQL Global Development Group · official platform documentation

    Supports: preferred label, short definition, variant distinction

    Limits: Default privileges do not retroactively secure current functions, constrain owners or establish all append-only properties.

  3. D30 glossary teaching-profile scope, Batch 013 The Fintech Builder · internal governed contract

    Supports: technical definition

    Limits: No independent regulatory mandate, real-bank dataset, service execution, external witness or production assurance is claimed.

Reviewed by
fintech-builder-batch-013
Last reviewed
2026-10-27
Next review
2027-10-27
Record status
evidence reviewed

This record is evidence-reviewed and readable, but not yet promoted to published — it is served noindex,follow and excluded from the sitemap.

Written by

Fintech engineer building market-data and financial systems, and the author of every article, glossary record, and reference implementation on The Fintech Builder.