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T4

Show HN: T4 – a versioned datastore with branching and time-travel (S3-backed)

44 AI Score
Show_hn devtools Added Apr 12, 2026

Details

Sector
devtools
Total Funding
$0
Last Round
$0

About

Hi HN,<p>I built t4, a datastore that stores its WAL and snapshots in S3.<p>Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL.<p>A side effect of this model is that the database becomes naturally versioned: you can restore any past state, branch from any point (with copy-on-write) and replay history<p>I started this as an experiment to replace etcd in Kubernetes, but it’s evolving into a general-purpose versioned state store.<p>Curious what people think about it and appreciate any feedback!

AI Score Reasoning

T4 taps into the high-growth cloud-native storage market by decoupling compute from state using S3, offering compelling features like branching and time-travel. While the technical direction is aligned with modern infrastructure trends, the lack of team data, funding, or significant community traction places it in the early experimental phase.

Source

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