--- title: "Fixing bugs in Event Sourcing is hard, for real?" url: https://daily.dev/posts/fixing-bugs-in-event-sourcing-is-hard-for-real--ardsmesga source_url: https://www.architecture-weekly.com/p/fixing-bugs-in-event-sourcing-is type: article source: "Architecture Weekly" published: 2026-07-27T14:22:07.416Z updated: 2026-07-27T14:22:32.599Z tags: ["architecture", "domain-driven-design"] reading_time: 14 upvotes: 1 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. # Fixing bugs in Event Sourcing is hard, for real? **[Architecture Weekly](https://daily.dev/sources/architectureweekly)** · 14 min read · 1 upvotes · 0 comments ## Summary When bugs corrupt data in state-based systems, each corrective migration overwrites the evidence needed to verify the fix, creating a chain of cascading repairs. Event sourcing preserves the original inputs alongside every change, making it possible to identify exactly which events a broken build produced (via buildSha metadata), calculate correct values without reconstruction, and append corrective events rather than rewriting history. A practical hotel reservation scenario illustrates how to detect already-handled corrections, avoid overwriting deliberate manual adjustments, and treat data correction as a first-class domain operation built before incidents occur. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Fixing bugs in Event Sourcing is hard, for real?](https://daily.dev/posts/fixing-bugs-in-event-sourcing-is-hard-for-real--5jiiodj7f) · Event-Driven by Oskar Dudycz · 1 upvotes · 0 comments - [Debugging as a design goal](https://daily.dev/posts/debugging-as-a-design-goal-p6g6p3nlp) · PHPUnit Expert · 13 upvotes · 1 comments - [Event Sourcing: temporally misplaced or duplicated events](https://daily.dev/posts/event-sourcing-temporally-misplaced-or-duplicated-events-xgqvcyral) · We Are .NET · 1 upvotes · 0 comments - [Event Sourcing: You better Prevent long event streams](https://daily.dev/posts/event-sourcing-you-better-prevent-long-event-streams-ebtbewtn0) · We Are .NET · 0 upvotes · 0 comments --- Tags: [#architecture](https://daily.dev/tags/architecture), [#domain-driven-design](https://daily.dev/tags/domain-driven-design) [View this post on daily.dev](https://daily.dev/posts/fixing-bugs-in-event-sourcing-is-hard-for-real--ardsmesga)