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 I'm not a DB guru, but like just use the zone id number as a prefix to your npcs. decide a max number of npcs per zone lets say 9999
 example:
 Lanshun novashine(sp) in n qey  10001
 Marrisa clothspinner(sp) in n qey 10002
 Priest of discord in n qey          9990003 (using 999 for global npcs)
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