Change hashtag trends to be stored in the database instead of redis (#32837)

Co-authored-by: David Roetzel <david@roetzel.de>

db/post_migrate/20241123160722_move_tag_trends_to_table.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class MoveTagTrendsToTable < ActiveRecord::Migration[7.2]
+  include Redisable
+
+  disable_ddl_transaction!
+
+  def up
+    redis.zrange('trending_tags:all', 0, -1, with_scores: true).each do |(tag_id, score)|
+      TagTrend.create(
+        tag_id: tag_id,
+        score: score,
+        allowed: redis.zscore('trending_tags:allowed', tag_id).present?
+      )
+    end
+
+    TagTrend.recalculate_ordered_rank
+
+    redis.del('trending_tags:allowed', 'trending_tags:all')
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end