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fix: make allow-list additions idempotent #308

Job	Run time
build	53s
test (routes-media, --tests dev.typetype.server.SearchRoutesTest --tests dev.typetype.server.Tren...	56s
test (extraction, --tests dev.typetype.server.ExtractionTest --tests dev.typetype.server.StreamRo...	53s
test (routes-user, --tests dev.typetype.server.SearchHistoryRoutesTest --tests dev.typetype.serve...	1m 6s
	3m 48s