The owner decided (2026-10-07) that we do not connect to anything other teams run on the box, Redis
included. CACHE_URL was emptied on the server and our keys were removed from the shared Redis.
- settings: drop KEY_PREFIX / CACHE_KEY_PREFIX (it only existed because the Redis was shared); comments
say CACHE_URL is intentionally empty and ResilientRedisCache is ready for our own Redis.
- config/cache.py docstring and tests updated accordingly (11 tests, still run against a local redis-server).
- CLAUDE.md: new server rule 8 (touch only our own files and service), status block, historical line
that said "db1 is free" now says not to connect. README, operations, handbook, security doc (item 9
reopened as an open decision) say the same.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>