Create sample data in a given database quickly

sample-data.xqy

xquery version "1.0-ml";

declare private function local:random-hex($length as xs:integer) as xs:string {
  fn:string-join(for $n in 1 to $length
    return xdmp:integer-to-hex(xdmp:random(15)),
    ""
  )
};

declare function local:generate-uuid-v4() as xs:string {
  fn:string-join(
    (
      local:random-hex(8),
      local:random-hex(4),
      local:random-hex(4),
      local:random-hex(4),
      local:random-hex(12)
    ),
    "-"
  )
};

(: main :)
for $i in (1 to 50000)
let $guid := local:generate-uuid-v4()
return
xdmp:document-insert(concat($guid,".xml"),
<data>
  <dateTime>{fn:current-dateTime()}</dateTime>
  <guid>{$guid}</guid>
</data>)