[SirHumza]

Summary

Fixes #8574.

CachePersistenceLayer, CacheConnection and CacheClientProtocol were TypeAliases over the deprecated Redis* classes. Because they resolve to the same object, instantiating CachePersistenceLayer(client=...) raised the DeprecationWarning intended for RedisCachePersistenceLayer.

This moves the implementation into cache.py under the Cache* names and keeps redis.py as thin @deprecated subclasses, so only the old Redis* names warn.

Changes

• cache.py: the implementation now lives here under CacheClientProtocol, CacheConnection and CachePersistenceLayer (no deprecation).
• redis.py: RedisClientProtocol, RedisConnection and RedisCachePersistenceLayer are now @deprecated subclasses of the corresponding Cache* classes, keeping the old messages.
• tests: updated the mock.patch targets to the new module location and added a regression test asserting CachePersistenceLayer does not warn while RedisCachePersistenceLayer does.

Testing

$ python -m pytest tests/functional/idempotency/_redis/test_redis_layer.py -q
24 passed

$ python -m pytest tests/functional/idempotency -q
192 passed (2 unrelated collection errors: optional `fastjsonschema` not installed locally)

$ ruff check ... && ruff format --check ...
clean

Behavior check:

CachePersistenceLayer(client=...)          # no warning (before: warned)
RedisCachePersistenceLayer(client=...)    # DeprecationWarning (unchanged)

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Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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