Some initial UI work

app/models/course.rb

@@ -1,2 +1,3 @@
 class Course < ApplicationRecord
+  has_many :lectures
 end

app/models/lecture.rb

@@ -3,9 +3,13 @@ class Lecture < ApplicationRecord
 
   enum :status, [
     :future,
-    :live,
-    :attended,
-    :watched,
+    :happening_now,
+    :attended_in_person,
+    :watched_recording,
     :missed,
   ]
+
+  def week_number
+    ((start_time.beginning_of_week - Time.new('2023-10-02')) / 1.week).floor
+  end
 end