Remove attendances model

app/models/attendance.rb

@@ -1,13 +0,0 @@
-class Attendance < ApplicationRecord
-  belongs_to :lecture
-
-  enum :kind, [
-    :concurrent,
-    :catchup
-  ]
-
-  def duration
-    toggl_data['time_entries'].sum { |entry| entry['seconds'] }
-                              .seconds
-  end
-end

app/models/lecture.rb

@@ -1,6 +1,5 @@
 class Lecture < ApplicationRecord
   belongs_to :course
-  has_one :attendance, dependent: :destroy
   has_one :recording, dependent: :nullify
 
   has_many :tracked_time_entries, dependent: :destroy