feat: limit concurrent sessions per user with active session management (CW-7169)

app/controllers/api/v1/profile/sessions_controller.rb

@@ -0,0 +1,31 @@
+class Api::V1::Profile::SessionsController < Api::BaseController
+  before_action :set_session, only: [:destroy]
+
+  def index
+    @sessions = current_user.user_sessions.order(last_activity_at: :desc)
+    @current_client_id = request.headers['client']
+  end
+
+  def destroy
+    if @session.current?(request.headers['client'])
+      render json: { error: I18n.t('profile_settings.sessions.cannot_revoke_current') }, status: :unprocessable_entity
+      return
+    end
+
+    revoke_token!(@session.client_id)
+    @session.destroy!
+    head :ok
+  end
+
+  private
+
+  def set_session
+    @session = current_user.user_sessions.find(params[:id])
+  end
+
+  def revoke_token!(client_id)
+    tokens = current_user.tokens
+    tokens.delete(client_id)
+    current_user.update!(tokens: tokens)
+  end
+end