chore: remove unused telegram bot model (#12417)

## Summary
- remove unused TelegramBot model and its association
- drop obsolete telegram_bots table

app/models/account.rb

@@ -89,7 +89,6 @@ class Account < ApplicationRecord
   has_many :portals, dependent: :destroy_async, class_name: '::Portal'
   has_many :sms_channels, dependent: :destroy_async, class_name: '::Channel::Sms'
   has_many :teams, dependent: :destroy_async
-  has_many :telegram_bots, dependent: :destroy_async
   has_many :telegram_channels, dependent: :destroy_async, class_name: '::Channel::Telegram'
   has_many :twilio_sms, dependent: :destroy_async, class_name: '::Channel::TwilioSms'
   has_many :twitter_profiles, dependent: :destroy_async, class_name: '::Channel::TwitterProfile'

app/models/telegram_bot.rb

@@ -1,17 +0,0 @@
-# == Schema Information
-#
-# Table name: telegram_bots
-#
-#  id         :integer          not null, primary key
-#  auth_key   :string
-#  name       :string
-#  created_at :datetime         not null
-#  updated_at :datetime         not null
-#  account_id :integer
-#
-
-class TelegramBot < ApplicationRecord
-  belongs_to :account
-  has_one :inbox, as: :channel, dependent: :destroy_async
-  validates :auth_key, uniqueness: { scope: :account_id }
-end

db/migrate/20250826000000_drop_telegram_bots.rb

@@ -0,0 +1,10 @@
+class DropTelegramBots < ActiveRecord::Migration[7.1]
+  def change
+    drop_table :telegram_bots do |t|
+      t.string :name
+      t.string :auth_key
+      t.integer :account_id
+      t.timestamps
+    end
+  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[7.1].define(version: 2025_08_25_070005) do
+ActiveRecord::Schema[7.1].define(version: 2025_08_26_000000) do
   # These extensions should be enabled to support this database
   enable_extension "pg_stat_statements"
   enable_extension "pg_trgm"
@@ -1146,14 +1146,6 @@ ActiveRecord::Schema[7.1].define(version: 2025_08_25_070005) do
     t.index ["name", "account_id"], name: "index_teams_on_name_and_account_id", unique: true
   end
 
-  create_table "telegram_bots", id: :serial, force: :cascade do |t|
-    t.string "name"
-    t.string "auth_key"
-    t.integer "account_id"
-    t.datetime "created_at", precision: nil, null: false
-    t.datetime "updated_at", precision: nil, null: false
-  end
-
   create_table "users", id: :serial, force: :cascade do |t|
     t.string "provider", default: "email", null: false
     t.string "uid", default: "", null: false

spec/models/account_spec.rb

@@ -8,7 +8,6 @@ RSpec.describe Account do
   it { is_expected.to have_many(:inboxes).dependent(:destroy_async) }
   it { is_expected.to have_many(:conversations).dependent(:destroy_async) }
   it { is_expected.to have_many(:contacts).dependent(:destroy_async) }
-  it { is_expected.to have_many(:telegram_bots).dependent(:destroy_async) }
   it { is_expected.to have_many(:canned_responses).dependent(:destroy_async) }
   it { is_expected.to have_many(:facebook_pages).class_name('::Channel::FacebookPage').dependent(:destroy_async) }
   it { is_expected.to have_many(:web_widgets).class_name('::Channel::WebWidget').dependent(:destroy_async) }