You may be fooling yourself with your ID length of 128. On many platforms, the limiting factor is the size of the seed, which is often 32 bits. Running continuously, your code will produce duplicate keys after producing about 2^32/128 of them. (And there is no guarantee that you wouldn't produce a duplicate before that.) On subsequent runs, you have essentially the same problem. Random numbers would be bad enough. Pseudo random numbers create additional problems.
-sauoq
"My two cents aren't worth a dime.";
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