redisstore.userBaseValue has no Deleted/DeletedAt/Status field, so caching a
deleted user silently reset Deleted back to false (and Status to the zero
UserStatusUnknown) on every round trip. That never self-healed: each later
cache miss reloaded the correctly tombstoned DB row and immediately
re-corrupted it on write, so once anyone looked a deleted account up, it kept
showing a blank name with "last seen recently" instead of "Deleted Account".
Keep deleted users off the base cache entirely so lookups always hit the
authoritative store, and stop presence overlay from touching a Deleted user's
Status at all as defense in depth.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
