`data(obs_1min)`: non-uniform resolution

``` r
library(timeseriesIO)
#> 0.7.84

rbind(obs_list[["RWH_01"]]["1994-07-01/2008-10-14"] |> xts_trim_na(),
      obs_list[["RS_01"]]["2008-10-14/2024-06-21"] |> xts_trim_na()) |> 
  xts_get_resolution()
#> 1   60 1440   11    9  721 1021 1201 2161 2881
```

for now, fixed by `xts_inflate(unit = "1 min", fill = 0)`