A schedule generated from a full production history, or a large raw text block
imported into the event timeline, easily exceeds the gRPC default limit of 4 MB.
Such a call failed with "Received message larger than max (5119402 vs 4194304)"
even though both sides were healthy.
Raise the limit to 128 MB on the server and use a matching limit for the client
channels. A schedule of 19.5 MB is now returned without error.