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Howto create a signal with constant value

In some cases you want to create "signal" with constant value, for example, Race, all population are "White". You need to add this block: 

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{ "pre_processors" : [
  {
    "action_type":"rp_set",
    "members":[
        {
            "rp_type":"calc_signals",
            "calculator":"exists",
            "names":"Race",
            "signals":"MEMBERSHIP",
            "max_time_search_range":"0",
            "signals_time_unit":"Minutes",
            "calculator_init_params":"{in_range_val=1}",
            "unconditional":"0"
        }
    ]
  }
] }
The input signal in : "signals" should contain signal with "time channel" you can't pass BDATE or GENDER (we might change the code to support this). the  in_range_val="1" contains the output of the signal, 1 for all records.  If you want to use this as dictionary, you will need to specify a dictionary with the mapping of the value "1" into the desired string.  In our example, that we want to generate "Race=White" for all, we will need to add this dict to the repository (TODO: in the future we might configure the dictionary virtually and skip that). 
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SECTION Race
DEF 1   White
and add this dicts to the repository