groundhog

The permanent record of everything your systems do.

Every change across your connected systems — APIs, databases, files, agents — kept as one append-only log. Everything downstream is rebuilt from it, at will.

019f45a5-f140-7c2e-9b1d-3e7a1c90d442 groundhog/site announcement.published 2026-07-09T20:11:04Z · sealed ✓
§ 1

Every change on every connected system is an event, recorded as-is.

stripe payments_db pricing_sheet
different sources, different shapes — settled exactly as they arrived.
§ 2

Nothing is ever edited. Nothing is ever deleted. A correction is one more event.

the mistake — kept the correction — beside it, never over it
a fix stands next to what it fixes. old ground is never dug up.
§ 3

Warehouses, dashboards, answers — projections. Deleting them is safe. Rebuilding them is routine.

the warehouse ✓ identical, every time reports data/log/ — the maintained artifact
answers that happen to be saved — set them down, raise them again, identical.
§ 4

Agents act on the record, and their actions land in the same record — what they did, beside what they knew.

what it knew what it did
the audit trail is a filter, not a subsystem.
§ 5

The format is open. Whoever owns the data can always read it, and leave.

yours to carry
NDJSON · Parquet · a JSON manifest — with us, or without us.

Software forgets. Groundhog doesn't.

− 64 m
− 71 m
− 80 m
bedrock — the core

ground-core — one Rust binary: the log, the warehouse, the query engine. Open source, free to build on.

Build your next app here.

read the log → writing →