Provide rough draft of better project organization

src/invidious/jobs/base_job.cr

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+abstract class Invidious::Jobs::BaseJob
+  abstract def begin
+end

src/invidious/jobs/pull_popular_videos_job.cr

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+class Invidious::Jobs::PullPopularVideosJob < Invidious::Jobs::BaseJob
+  QUERY = <<-SQL
+    SELECT DISTINCT ON (ucid) *
+    FROM channel_videos
+    WHERE ucid IN (SELECT channel FROM (SELECT UNNEST(subscriptions) AS channel FROM users) AS d
+    GROUP BY channel ORDER BY COUNT(channel) DESC LIMIT 40)
+    ORDER BY ucid, published DESC
+  SQL
+  POPULAR_VIDEOS = Atomic.new([] of ChannelVideo)
+  private getter db : DB::Database
+
+  def initialize(@db)
+  end
+
+  def begin
+    loop do
+      videos = db.query_all(QUERY, as: ChannelVideo)
+        .sort_by(&.published)
+        .reverse
+
+      POPULAR_VIDEOS.set(videos)
+
+      sleep 1.minute
+      Fiber.yield
+    end
+  end
+end