Instead of using spoiler boolean and spoiler_text, simply check for non-blank spoiler_text

Federate spoiler_text using warning attribute on <content /> instead of a <category term="spoiler" />
Clean up schema file from accidental development migrations

app/lib/status_length_validator.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class StatusLengthValidator < ActiveModel::Validator
+  MAX_CHARS = 500
+
+  def validate(status)
+    return unless status.local? && !status.reblog?
+    status.errors.add(:text, I18n.t('statuses.over_character_limit', max: MAX_CHARS)) if [status.text, status.spoiler_text].join.length > MAX_CHARS
+  end
+end