Function bar_spec_to_derive_period 

pub fn bar_spec_to_derive_period(
    aggregation: BarAggregation,
    step: u64,
) -> Result<u32>

Maps a Nautilus bar aggregation and step to the Derive period enum value (bucket size in seconds).

Derive supports the following bucket sizes: 60, 300, 900, 1800, 3600, 14400, 28800, 86400, 604800.

Errors

Returns an error if the aggregation or step has no Derive equivalent.