Add Devise’s lockable to prevent multiple consecutive failed login attempts

app/models/user.rb

@@ -5,7 +5,7 @@ class User < ApplicationRecord
   validates :password, length: { within: 8..128, allow_blank: true }, presence: { if: :password_required? }
 
   # Devise
-  devise :database_authenticatable, :rememberable, :trackable, :recoverable, :password_archivable, :session_limitable
+  devise :database_authenticatable, :rememberable, :trackable, :recoverable, :password_archivable, :session_limitable, :lockable
 
   # FriendlyId
   extend FriendlyId

config/initializers/devise.rb

@@ -164,24 +164,24 @@
   # Defines which strategy will be used to lock an account.
   # :failed_attempts = Locks an account after a number of failed attempts to sign in.
   # :none            = No lock strategy. You should handle locking by yourself.
-  # config.lock_strategy = :failed_attempts
+  config.lock_strategy = :failed_attempts
 
   # Defines which key will be used when locking and unlocking an account
-  # config.unlock_keys = [ :email ]
+  config.unlock_keys = [:email]
 
   # Defines which strategy will be used to unlock an account.
   # :email = Sends an unlock link to the user email
   # :time  = Re-enables login after a certain amount of time (see :unlock_in below)
   # :both  = Enables both strategies
   # :none  = No unlock strategy. You should handle unlocking by yourself.
-  # config.unlock_strategy = :both
+  config.unlock_strategy = :time
 
   # Number of authentication tries before locking an account if lock_strategy
   # is failed attempts.
-  # config.maximum_attempts = 20
+  config.maximum_attempts = 10
 
   # Time interval to unlock the account if :time is enabled as unlock_strategy.
-  # config.unlock_in = 1.hour
+  config.unlock_in = 1.hour
 
   # ==> Configuration for :recoverable
   #

db/migrate/20260423112300_add_lockable_to_users.rb

@@ -0,0 +1,8 @@
+class AddLockableToUsers < ActiveRecord::Migration[8.0]
+  def change
+    add_column :users, :failed_attempts, :integer, default: 0, null: false
+    add_column :users, :unlock_token, :string
+    add_column :users, :locked_at, :datetime
+    add_index :users, :unlock_token, unique: true
+  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[8.0].define(version: 2025_07_31_014203) do
+ActiveRecord::Schema[8.0].define(version: 2026_04_23_112300) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
@@ -107,6 +107,10 @@
     t.string "reset_password_token"
     t.datetime "reset_password_sent_at", precision: nil
     t.string "unique_session_id"
+    t.integer "failed_attempts", default: 0, null: false
+    t.string "unlock_token"
+    t.datetime "locked_at"
+    t.index ["unlock_token"], name: "index_users_on_unlock_token", unique: true
   end
 
   create_table "versions", id: :serial, force: :cascade do |t|