Cheesy Hot Dogs with Pickle-Pepper Relish

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1/4 cup apple cider vinegar

2 teaspoons sugar

1/4 teaspoon celery seeds

1/4 teaspoon yellow mustard seeds

1/2 cup finely chopped dill pickles

1/4 cup finely chopped pickled yellow pepper rings

2 tablespoons finely chopped pimientos

1 tablespoon finely chopped pickled jalapeno peppers

1 tablespoon finely chopped fresh chives

Kosher salt

4 hot dogs

4 top-split hot dog buns

2 tablespoons unsalted butter, melted

4 slices American cheese, quartered

Ketchup and mustard, for topping