By Islam BarakaDefinitions
In plain terms
The system retains what happened, then folds the history to calculate a current or historical view.
Technical
A D30 balance projection accepts the declared sequence and folds committed postings; corrections add new history rather than editing the past.
Scope
Reconstruction depends on complete eligible history and stable semantics; it is not automatically a database durability guarantee.
Examples
- Replaying a synthetic deposit and later fee rebuilds the same selected posted balance.
Common misconceptions
- An arbitrary list of logs is not necessarily an authoritative event store.
Concept relationships
Where this concept is used
Evidence and governance
- 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.
- 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.