--- title: "Implementing a DCB-Compliant Event Store in SQLite" url: https://daily.dev/posts/implementing-a-dcb-compliant-event-store-in-sqlite-qsevjk35x source_url: https://maximegosselin.com/posts/implementing-a-dcb-compliant-event-store-in-sqlite/ type: article source: "Maxime Gosselin" published: 2026-03-22T11:39:32.145Z updated: 2026-03-22T11:39:52.947Z tags: ["architecture", "sql", "sqlite"] reading_time: 10 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Implementing a DCB-Compliant Event Store in SQLite **[Maxime Gosselin](https://daily.dev/sources/maximegosselin)** · 10 min read · 0 upvotes · 0 comments ## Summary A walkthrough of implementing a DCB (Dynamic Consistency Boundary)-compliant Event Store using SQLite with just a four-column table and a conditional INSERT. The approach maps each DCB specification requirement to a SQL construct: event type and tag filtering via JSON_EXTRACT, sequence positions via AUTOINCREMENT, and optimistic locking via a conditional INSERT...SELECT...WHERE that re-runs the read query to verify no conflicting events were appended concurrently. The technique works safely in SQLite due to its file-level lock, and the appendix explains how to adapt it for PostgreSQL/MySQL using SERIALIZABLE transaction isolation. The implementation is used by the open-source PHP Backslash Event Sourcing library. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Event Sourcing: Aggregates, Dynamic Consistency Boundaries, or what?](https://daily.dev/posts/event-sourcing-aggregates-dynamic-consistency-boundaries-or-what--r7brnhrcu) · We Are .NET · 1 upvotes · 0 comments --- Tags: [#architecture](https://daily.dev/tags/architecture), [#sql](https://daily.dev/tags/sql), [#sqlite](https://daily.dev/tags/sqlite) [View this post on daily.dev](https://daily.dev/posts/implementing-a-dcb-compliant-event-store-in-sqlite-qsevjk35x)