i have 2 questions, full disclosure: i don't understand back end infrastructure too well 1# *is kv

i have 2 questions, full disclosure: i don't understand back end infrastructure too well

1# is kv as secure as d1? like can i store emails as keys on it? is that a good idea?? or will ANYONE be able to retrieve that info? the docs seem to imply it's fairly secure i think

2# how quick are updates if i write into kv? will that happen under 30 mins and be reflected everywhere?

if info about my use case is needed, i want to store a list of digital item's urls or ids (which i will fetch with ajax on client side)
stored as "email (who purchased) : json (nested list of items purchased)"

originally i thought user sign in sign up would be neat but i don't want the responsibility of storing passwords or anything for something as simple as "hey did the user purchase this product fully?", specially because payments will be handled face to face, not digitally and i will have to input emails and purchase list by hand anyway. i think getting email from google sign in or something then fetching the key : value pair seems reasonable and simple to me
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