Add soft delete for statuses for instant deletes through API (#11623)

* Add soft delete for statuses to allow them to appear instant

* Allow reporting soft-deleted statuses and show them in the admin UI

* Change index for getting an account's statuses

db/migrate/20190819134503_add_deleted_at_to_statuses.rb

@@ -0,0 +1,5 @@
+class AddDeletedAtToStatuses < ActiveRecord::Migration[5.2]
+  def change
+    add_column :statuses, :deleted_at, :datetime
+  end
+end

db/migrate/20190820003045_update_statuses_index.rb

@@ -0,0 +1,13 @@
+class UpdateStatusesIndex < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def up
+    safety_assured { add_index :statuses, [:account_id, :id, :visibility, :updated_at], where: 'deleted_at IS NULL', order: { id: :desc }, algorithm: :concurrently, name: :index_statuses_20190820 }
+    remove_index :statuses, name: :index_statuses_20180106
+  end
+
+  def down
+    safety_assured { add_index :statuses, [:account_id, :id, :visibility, :updated_at], order: { id: :desc }, algorithm: :concurrently, name: :index_statuses_20180106 }
+    remove_index :statuses, name: :index_statuses_20190820
+  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_15_225426) do
+ActiveRecord::Schema.define(version: 2019_08_20_003045) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -644,7 +644,8 @@ ActiveRecord::Schema.define(version: 2019_08_15_225426) do
     t.bigint "application_id"
     t.bigint "in_reply_to_account_id"
     t.bigint "poll_id"
-    t.index ["account_id", "id", "visibility", "updated_at"], name: "index_statuses_20180106", order: { id: :desc }
+    t.datetime "deleted_at"
+    t.index ["account_id", "id", "visibility", "updated_at"], name: "index_statuses_20190820", order: { id: :desc }, where: "(deleted_at IS NULL)"
     t.index ["in_reply_to_account_id"], name: "index_statuses_on_in_reply_to_account_id"
     t.index ["in_reply_to_id"], name: "index_statuses_on_in_reply_to_id"
     t.index ["reblog_of_id", "account_id"], name: "index_statuses_on_reblog_of_id_and_account_id"