Revert "Increase max backup size (mastodon#12602)"

This reverts commit 3830c0b.

app/models/backup.rb

@@ -7,7 +7,7 @@
 #  user_id           :bigint(8)
 #  dump_file_name    :string
 #  dump_content_type :string
-#  dump_file_size    :bigint
+#  dump_file_size    :integer
 #  dump_updated_at   :datetime
 #  processed         :boolean          default(FALSE), not null
 #  created_at        :datetime         not null

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_12_12_003415) do
+ActiveRecord::Schema.define(version: 2019_10_31_163205) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -200,7 +200,7 @@
     t.bigint "user_id"
     t.string "dump_file_name"
     t.string "dump_content_type"
-    t.bigint "dump_file_size"
+    t.integer "dump_file_size"
     t.datetime "dump_updated_at"
     t.boolean "processed", default: false, null: false
     t.datetime "created_at", null: false
@@ -703,6 +703,30 @@
     t.index ["tag_id", "status_id"], name: "index_statuses_tags_on_tag_id_and_status_id", unique: true
   end
 
+  create_table "stream_entries", force: :cascade do |t|
+    t.bigint "activity_id"
+    t.string "activity_type"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.boolean "hidden", default: false, null: false
+    t.bigint "account_id"
+    t.index ["account_id", "activity_type", "id"], name: "index_stream_entries_on_account_id_and_activity_type_and_id"
+    t.index ["activity_id", "activity_type"], name: "index_stream_entries_on_activity_id_and_activity_type"
+  end
+
+  create_table "subscriptions", force: :cascade do |t|
+    t.string "callback_url", default: "", null: false
+    t.string "secret"
+    t.datetime "expires_at"
+    t.boolean "confirmed", default: false, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.datetime "last_successful_delivery_at"
+    t.string "domain"
+    t.bigint "account_id", null: false
+    t.index ["account_id", "callback_url"], name: "index_subscriptions_on_account_id_and_callback_url", unique: true
+  end
+
   create_table "tags", force: :cascade do |t|
     t.string "name", default: "", null: false
     t.datetime "created_at", null: false