DEV: Update Discord webhook domain (#106)

discordapp.com is being deprecated and replaced with discord.com - https://github.com/discord/discord-api-docs/discussions/4510

db/post_migrate/20220215103720_update_discord_webhook_domains.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class UpdateDiscordWebhookDomains < ActiveRecord::Migration[6.1]
+  def up
+    execute <<~SQL
+      UPDATE plugin_store_rows psr
+      SET value = REPLACE(value, 'discordapp.com', 'discord.com')
+      WHERE psr.plugin_name = 'discourse-chat-integration'
+      AND psr.key LIKE 'channel:%'
+      AND psr.type_name = 'JSON'
+      AND psr.value::json ->> 'provider' = 'discord'
+      AND psr.value::json ->> 'data' LIKE '%https://discordapp.com/%'
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end