Change trending hashtags to not disappear instantly after midnight (#11712)

db/migrate/20190901035623_add_max_score_to_tags.rb

@@ -0,0 +1,6 @@
+class AddMaxScoreToTags < ActiveRecord::Migration[5.2]
+  def change
+    add_column :tags, :max_score, :float
+    add_column :tags, :max_score_at, :datetime
+  end
+end

db/post_migrate/20190901040524_remove_score_from_tags.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class RemoveScoreFromTags < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    safety_assured do
+      remove_column :tags, :score, :int
+      remove_column :tags, :last_trend_at, :datetime
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_08_23_221802) do
+ActiveRecord::Schema.define(version: 2019_09_01_040524) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -664,14 +664,14 @@ ActiveRecord::Schema.define(version: 2019_08_23_221802) do
     t.string "name", default: "", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.integer "score"
     t.boolean "usable"
     t.boolean "trendable"
     t.boolean "listable"
     t.datetime "reviewed_at"
     t.datetime "requested_review_at"
     t.datetime "last_status_at"
-    t.datetime "last_trend_at"
+    t.float "max_score"
+    t.datetime "max_score_at"
     t.index "lower((name)::text)", name: "index_tags_on_name_lower", unique: true
   end