Use Redis UNLINK instead of Redis DEL

[HishamAli81]

ISSUE

Currently,@keyv/redis uses the DEL function to remove entries from the Redis cache. The issue with DEL is that it is blocking and can take longer the larger the key size, whereas UNLINK is non-blocking and perform the operation in O(1) for each key removed regardless of its size.

References:

• https://redis.io/commands/unlink/
• https://redis.com/blog/the-little-known-feature-of-redis-4-0-that-will-speed-up-your-applications/

PROPOSED SOLUTION

In @keyv/redis, modify the delete() and clear() functions to use UNLINK instead of DEL to improve performance.

[jaredwray]

@HishamAli81 - thanks so much for sending this suggestion over. I am happy to look at this but would not plan to get to this for a bit. If you want to do a pull request I am happy to look at that.

[HishamAli81]

@jaredwray Thanks, I've created this PR for the proposed solution: #921