SFMS: Stations stored

[brettedw]

Describe the task
When we save_sfms_run, we're storing all the station codes from the actuals. But in the processing of each parameter, we're filtering these actuals based on "valid" data. We may still not really know which stations were used for interpolating data

Ex: 289 stations saved to db, 288 stations used for temp/rh/precip/wind speed, 287 stations used for wind direction

Acceptance Criteria

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