Add Rain Data Replacing Records for Existing Times

This function reads existing rain data with api_get_rain

api_replace_rain(user_id, spot_id, rain, rain_db = NULL, time_string,
  comment = "")

Arguments

user_id	user identifier
spot_id	bathing spot identifier
rain	data frame with new rain data
rain_db	optional. Data frame with existing rain data
time_string	passed to api_add_rain
comment	passed to api_add_rain