# ADR-0005 Redis — deferred

## Status

Deferred (not accepted for MVP)

## Decision

MVP does **not** require Redis. Use PostgreSQL + process memory only when safe.

## Reason

1. Reduce moving parts for first ship
2. Membership/session can start in Postgres

## When to revisit

Rate limiting, hot session cache, or distributed locks → write ADR-0005b Accepted before adding Redis.

## Never

Never add Redis “just in case” without an Accepted ADR update.