replace exits with raises in grid_setup, and remove the realtime check

assigned to @nickb

added 1 commit

• 306ae4e4 - move the handling of each minute into its own function - grid_minute() - which...

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added 1 commit

• 57de412f - add a simple try/catch for each minute so that a single minute's failure...

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merged

mentioned in commit 6b0e99e3