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

  • Hacker News

Hi HN, I built t4, a datastore that stores its WAL and snapshots in S3. Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL. A side effect of this model is that the database becomes naturally versioned:...

  • Published: Apr 12, 2026
  • First seen: Apr 12, 2026
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AI Summary

Hi HN, I built t4, a datastore that stores its WAL and snapshots in S3. Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL. A side effect of this model is that the database becomes naturally versioned:...

Best for

Teams evaluating AI product workflows / Builders comparing emerging tools / Operators tracking early category shifts

Why it matters

Primary discovery source is Hacker News.

Key Features

  • Primary public product URL is https://github.com/t4db/t4.
  • Description: Hi HN, I built t4, a datastore that stores its WAL and snapshots in S3. Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL. A side effect of....
  • GitHub repository is linked as t4db/t4.
  • Listed on Hacker News as "T4 – a versioned datastore with branching and time-travel (S3-backed)".
  • Source description: Hi HN, I built t4, a datastore that stores its WAL and snapshots in S3. Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL. A side effect of....

Use Cases

  • Primary discovery source is Hacker News.
  • A public GitHub repo is available for direct technical review.
  • Hacker News mention is recent (2026-04-12).
  • Primary public product URL is https://github.com/t4db/t4.
  • Description: Hi HN, I built t4, a datastore that stores its WAL and snapshots in S3. Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL. A side effect of....

Why Now

T4 – a versioned datastore with branching and time-travel (S3-backed) is appearing on fresh discovery surfaces, so it is worth reviewing while momentum is still forming. Confidence is currently medium (49/100), so treat this as an early signal rather than a settled trend.

Community Signals

Trend score

2.5

24h momentum

Rising

Hacker News points

7

Rising

Facts / Signals / Inference / Unknowns

Facts

  • Listed on Hacker News as "T4 – a versioned datastore with branching and time-travel (S3-backed)".
  • Source description: Hi HN, I built t4, a datastore that stores its WAL and snapshots in S3. Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL. A side effect of....
  • Source publish date is 2026-04-12.
  • Description: Hi HN, I built t4, a datastore that stores its WAL and snapshots in S3. Instead of traditional storage, it writes append-only segments to object storage and reconstructs state from checkpoints + WAL. A side effect of....
  • GitHub repository is linked as t4db/t4.
  • Primary public product URL is https://github.com/t4db/t4.

Signals

  • Hacker News mention is recent (2026-04-12).
  • A public GitHub repo is available for direct technical review.
  • Primary discovery source is Hacker News.

Inference

  • Public code access can lower evaluation friction for developer audiences.

Unknowns

  • Documentation is not explicitly linked in the current allowed evidence set.
  • No tagline is stored on the current product record.
  • Pricing details are not explicitly linked in the current allowed evidence set.
  • Recent changelog or release history is not explicitly linked in the current allowed evidence set.
  • Release cadence cannot be confirmed unless a changelog or release link is explicitly provided.

Evidence Snapshots

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

Listed on Hacker News as "T4 – a versioned datastore with branching and time-travel (S3-backed)".

T4 – a versioned datastore with branching and time-travel (S3-backed) GitHub repository

GitHub repository is linked as t4db/t4.

T4 – a versioned datastore with branching and time-travel (S3-backed) official profile

Primary public product URL is https://github.com/t4db/t4.

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Original Sources

Hacker News