[Python] Want to downsample timeseries dataframe with Polars group_by_dynamic including empty...

I'm trying to downsample a dataframe in polars which has a column with timestamps. I want to downsample the column to intervals of 1s. But when i do this using group_by_dynamic only the seconds which have values are coming in the result. But I want the result to contain even seconds which has no entries so I can forward fill.

I tried group_by_dynamic, and it doesnt seem to do what I want.

taq_df.group_by_dynamic("timestamp", every = '1s').agg(pl.exclude("bestex_timestamp").last())

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