Make Web::PushSubscription#user and Web::PushSubscription#access_token relationships non-optional (#34498)

Co-authored-by: Emelia Smith <ThisIsMissEm@users.noreply.github.com>

db/migrate/20250422083912_add_not_null_to_web_push_subscription_user.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddNotNullToWebPushSubscriptionUser < ActiveRecord::Migration[8.0]
+  def change
+    add_check_constraint :web_push_subscriptions, 'user_id IS NOT NULL', name: 'web_push_subscriptions_user_id_null', validate: false
+  end
+end

db/migrate/20250422084214_validate_add_not_null_to_web_push_subscription_user.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class ValidateAddNotNullToWebPushSubscriptionUser < ActiveRecord::Migration[8.0]
+  def up
+    connection.execute(<<~SQL.squish)
+      DELETE FROM web_push_subscriptions
+      WHERE user_id IS NULL
+    SQL
+
+    validate_check_constraint :web_push_subscriptions, name: 'web_push_subscriptions_user_id_null'
+    change_column_null :web_push_subscriptions, :user_id, false
+    remove_check_constraint :web_push_subscriptions, name: 'web_push_subscriptions_user_id_null'
+  end
+
+  def down
+    add_check_constraint :web_push_subscriptions, 'user_id IS NOT NULL', name: 'web_push_subscriptions_user_id_null', validate: false
+    change_column_null :web_push_subscriptions, :user_id, true
+  end
+end

db/migrate/20250422085027_add_not_null_to_web_push_subscription_access_token.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddNotNullToWebPushSubscriptionAccessToken < ActiveRecord::Migration[8.0]
+  def change
+    add_check_constraint :web_push_subscriptions, 'access_token_id IS NOT NULL', name: 'web_push_subscriptions_access_token_id_null', validate: false
+  end
+end

db/migrate/20250422085303_validate_add_not_null_to_web_push_subscription_access_token.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class ValidateAddNotNullToWebPushSubscriptionAccessToken < ActiveRecord::Migration[8.0]
+  def up
+    connection.execute(<<~SQL.squish)
+      DELETE FROM web_push_subscriptions
+      WHERE access_token_id IS NULL
+    SQL
+
+    validate_check_constraint :web_push_subscriptions, name: 'web_push_subscriptions_access_token_id_null'
+    change_column_null :web_push_subscriptions, :access_token_id, false
+    remove_check_constraint :web_push_subscriptions, name: 'web_push_subscriptions_access_token_id_null'
+  end
+
+  def down
+    add_check_constraint :web_push_subscriptions, 'access_token_id IS NOT NULL', name: 'web_push_subscriptions_access_token_id_null', validate: false
+    change_column_null :web_push_subscriptions, :access_token_id, true
+  end
+end