safe-global / safe-client-gateway / 24577536837 / 2

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Pull #2926

github

refactor: enhance derived key caching with TTL and update related tests

- Introduced a maximum age for derived keys in the encryption utility to ensure stale entries are removed.
- Updated the caching mechanism to store both the key and its creation timestamp.
- Added a test to verify that keys are re-derived after expiration.
- Improved comments for clarity in the Redis cache service and Zerion portfolio API.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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