polaris.tasks.ocean.analysis.accumulate.Accumulator.run

Accumulator.run()

Reduce the months that were not inherited, and hand on the series

The cache is rewritten as each month is added rather than at the end, so that a run that is interrupted leaves a cache its retry can start from. It holds tens of kilobytes, so rewriting it whole is cheaper than the bookkeeping an append would need, and it is atomic.