DEV: Move discourse-chat to the core repo. (#18776)

As part of this move, we are also renaming `discourse-chat` to `chat`.

plugins/chat/app/models/incoming_chat_webhook.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class IncomingChatWebhook < ActiveRecord::Base
+  belongs_to :chat_channel
+  has_many :chat_webhook_events
+
+  before_create { self.key = SecureRandom.hex(12) }
+
+  def url
+    "#{Discourse.base_url}/chat/hooks/#{key}.json"
+  end
+end
+
+# == Schema Information
+#
+# Table name: incoming_chat_webhooks
+#
+#  id              :bigint           not null, primary key
+#  name            :string           not null
+#  key             :string           not null
+#  chat_channel_id :integer          not null
+#  username        :string
+#  description     :string
+#  emoji           :string
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#
+# Indexes
+#
+#  index_incoming_chat_webhooks_on_key_and_chat_channel_id  (key,chat_channel_id)
+#