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git-bug Shows How Git Refs Can Store Arbitrary Data Without a Database

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The open-source tool git-bug, which recently trended on Hacker News, stores bug-tracking data entirely inside a Git repository using custom refs, requiring no external server or database. Each issue is represented as a ref under refs/bugs/, with every change — such as comments or label updates — recorded as a new JSON-based commit linked to its predecessor. This approach leverages Git's built-in content-addressable object store, replication, and deduplication capabilities, effectively turning it into a lightweight event-log database. Developers can apply the same technique to store CI metadata, review notes, audit logs, or deploy configs tied to specific commits using standard Git plumbing commands. The method also supports optimistic locking via git update-ref's compare-and-swap parameter, and data can be synced to remotes by explicitly declaring custom refspecs.

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