DECRBY key decrement
Decrements the number stored at key by decrement. If the key does not exist, it is set to 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer. This operation is limited to 64 bit signed integers.
See INCR for extra information on increment/decrement operations.
Integer reply: the value of key after the decrement
"OK" redis> DECRBY mykey 3 (integer) 7
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https://redis.io/commands/decrby