Remove Session date column

This is replaced by the SessionDate model which captures multiple dates
per session.

app/models/session.rb

@@ -7,7 +7,6 @@
 #  id                        :bigint           not null, primary key
 #  active                    :boolean          default(FALSE), not null
 #  close_consent_at          :date
-#  date                      :date
 #  send_consent_reminders_at :date
 #  send_consent_requests_at  :date
 #  time_of_day               :integer

db/migrate/20240925081048_remove_date_from_sessions.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class RemoveDateFromSessions < ActiveRecord::Migration[7.2]
+  def up
+    Session.all.find_each do |session|
+      next if (date = session.date).nil?
+      session.dates.create!(value: date)
+    end
+
+    remove_column :sessions, :date
+  end
+
+  def down
+    add_column :sessions, :date, :date
+  end
+end

spec/factories/sessions.rb

@@ -7,7 +7,6 @@
 #  id                        :bigint           not null, primary key
 #  active                    :boolean          default(FALSE), not null
 #  close_consent_at          :date
-#  date                      :date
 #  send_consent_reminders_at :date
 #  send_consent_requests_at  :date
 #  time_of_day               :integer
@@ -32,7 +31,6 @@
     team { programmes.first&.team || association(:team) }
     location { association :location, :school }
 
-    date { Time.zone.today }
     send_consent_requests_at { date - 14.days }
     send_consent_reminders_at { send_consent_requests_at + 7.days }
     close_consent_at { date }

spec/models/session_spec.rb

@@ -7,7 +7,6 @@
 #  id                        :bigint           not null, primary key
 #  active                    :boolean          default(FALSE), not null
 #  close_consent_at          :date
-#  date                      :date
 #  send_consent_reminders_at :date
 #  send_consent_requests_at  :date
 #  time_of_day               :integer