I have a local testnet running and it works until the first lease period is up. Once the first lease period finishes the chain stops producing blocks. I am looking for an easy way to submit some extrinsics to extend the lease period for a parachain -- or would I have to do something more complex in order to accomplish this?

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IMHO, you could call sudo_schedule_parathread_upgrade first to onboard your chain. Then call force_lease to change the lease.

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