method Kv.watch

use std.kv { Kv, KvError }

fn change(kv: Kv) -> () | KvError  io, db, time {
  sleep(150ms)
  kv.put("job/1", b"queued")?
  kv.delete("job/1")?
}

fn main() -> () | KvError | Panicked  io, db, time {
  let kv = Kv.open("docs-kvwatch")?
  scope {
    spawn change(kv)
    var seen = 0
    for await e in kv.watch("job/") {
      print("{e.key} deleted={e.deleted}")
      seen += 1
      if seen == 2 { break }
    }
  }?
  kv.close()
}

job/1 deleted=false
job/1 deleted=true