f_reactable <- function(daten, coldefs = NULL, selection = "single", 
  defaultSelected = NULL, hoehe = NULL, highlight_valuta = NULL) {
  reactable(
    daten,
    selection = selection,
    defaultSelected = defaultSelected, # Ermöglicht das Wiederherstellen der Auswahl
    pagination = F,
    defaultPageSize = 17,
    showPageSizeOptions = TRUE,
    filterable = TRUE,
    highlight = TRUE,
    height = hoehe,            # <--- FIXIERT DEN HEADER und macht den Body scrollbar
    bordered = TRUE,
    striped = FALSE,
    compact = TRUE,
    # Styling
    theme = reactableTheme(
      highlightColor = "#e6f7ff", # Etwas dezenter als knallgrün, optional
      # borderColor = "#dfe2e5",
      rowSelectedStyle = list(backgroundColor = "#98F5FF")#
    ),
    rowStyle = function(index) {
      style <- list(cursor = "pointer")  # immer aktiv
      
      if (!is.null(highlight_valuta) && 
          daten$valuta[index] == highlight_valuta) {
        style$background <- "#fff3cd"
      }
      
      style
    },
    onClick = "select",
    columns = coldefs
  )
}