> ## Documentation Index
> Fetch the complete documentation index at: https://headgate.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Redis

> Atomic Lua admission for Redis-native fleets.

Redis evaluates admission in one Lua script using `redis.call('TIME')` as the fleet clock.
Claims, leases, token spending, fairness charges, concurrency, and quarantine decisions are
committed atomically.

## Capability boundary

Redis supports the core runtime and inspection contracts but does not pretend to provide
SQL application transactions. Transaction-dependent APIs such as `step_once` decline with
an explicit capability error.

## Operational notes

* Use a distinct key prefix for each headgate instance.
* Test isolation uses `SCAN` plus bounded `DEL` batches—never `KEYS` or `FLUSHDB`.
* Store time avoids worker clock skew in refill and lease decisions.

<Card title="Test Redis safely" icon="flask-conical" href="/docs/operations/testing" />