Added helper function for fetching history for a given epoch range for one to all pools, can be utilized for populating cache and is used in updated pool_history function that performs calculations on the fly for the most recent 3 epochs (to facilitate reward table update lag)
Added helper function for fetching history for a given epoch range for one to all pools, can be utilized for populating cache and is used in updated pool_history function that performs calculations on the fly for the most recent 3 epochs (to facilitate reward table update lag)
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