The is under avalon/script/waveform_backfill.rb.

Upon initial run, it scans all master file solr indices to retrieve the IDs of those that don't have waveform stored yet, and save them into a tmp file '/srv/avalon/scriptdata/waveform_backfill.txt'
It then schedules Waveform Job for each such master file
Upon subsequence runs, the script will reuse the saved file to avoid massive read from solr.

To run the script, make sure directory srv/avalon/scriptdata/ exists on the server.

Usage: bundle exec rails runner script/waveform_backfill.rb [start_index] [ row_max]

The script takes 2 optional parameters:

start_index: the index of the row within waveform_backfill.txt, default 1. If the script failed and needs a restart, one can check the log to see which row/masterfile ID it failed at, and restart from there.
row_max: maximum number of rows to retrieve, default 1000000. This is only useful for the initial run, especially for testing, one can set a small number to test.

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