Bubble up more metadata to collections

[alecgorge]

Our most interesting data is at the track and source level. We need to make this available efficiently at higher levels:

• show_source_information

  • source: has_soundboard_source
  • source: source_count
  • source: max_avg_rating_weighted
  • source: has_flac
  • track: jamchart_track_count

• year

  • source: duration
  • source: avg_duration
  • show/source: avg_rating
  • source: source_count
  • show: show_count
  • track: jamchart_track_count

• venue_show_counts

  • show: shows_at_venue
  • track: jamchart_track_count

• setlist_songs_plays_information

  • track: is_jamchart (only possible for features.setlist_song_play_maps_to_track, uses track_id)
  • track: duration (only possible for features.setlist_song_play_maps_to_track, uses track_id)