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migrate from java's executor impl to spring's abstraction: let spring handle the bean lifecycle, graceful shutdown etc.
separate on interface-level between scheduled and async tasks: we only have 1 use case for scheduled tasks (websocket ping-pongs), whereas all other usages of ScheduledExecutorService were just async job submissions. separation might be useful in future, if we want to have distinct thread pools as well.
with regards to the previous point: separate TaskExecutor and TaskScheduler usage already