# Which Problems Are Solved
Cached object may have a different schema between Zitadel versions.
# How the Problems Are Solved
Use the curent build version in DB based cache connectors PostgreSQL and
Redis.
# Additional Changes
- Cleanup the ZitadelVersion field from the authz Instance
- Solve potential race condition on global variables in build package.
# Additional Context
- Closes https://github.com/zitadel/zitadel/issues/10648
- Obsoletes https://github.com/zitadel/zitadel/pull/10646
- Needs to be back-ported to v4 over
https://github.com/zitadel/zitadel/pull/10645
(cherry picked from commit f6f37d3a31)
# Which Problems Are Solved
Add a cache implementation using Redis single mode. This does not add
support for Redis Cluster or sentinel.
# How the Problems Are Solved
Added the `internal/cache/redis` package. All operations occur
atomically, including setting of secondary indexes, using LUA scripts
where needed.
The [`miniredis`](https://github.com/alicebob/miniredis) package is used
to run unit tests.
# Additional Changes
- Move connector code to `internal/cache/connector/...` and remove
duplicate code from `query` and `command` packages.
- Fix a missed invalidation on the restrictions projection
# Additional Context
Closes#8130
