How To make Different Users get different CloudDB results?

Hi! I am making an app which keeps record of different children diseases. when i log in to account1 and save in cloudDB that i have X disease, and then log in with account2 it is showing that i haveX disease. how to solve this? also, how to add different cloudDB servers? if i add a vaccine screen, where i input the vaccines i got, when i pull up data it is mixing the disease and vaccines, and also different accounts!

These are symptoms of poor tag design, where the tags do not identify the user in addition to the disease.

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