Update migration to have null: false

db/migrate/20210222030537_add_is_removed_to_oncall_participant.rb

@@ -7,11 +7,13 @@ class AddIsRemovedToOncallParticipant < ActiveRecord::Migration[6.0]
 
   def up
     with_lock_retries do
-      add_column :incident_management_oncall_participants, :is_removed, :boolean, default: false
+      add_column :incident_management_oncall_participants, :is_removed, :boolean, default: false, null: false
     end
   end
 
   def down
+    with_lock_retries do
       remove_column :incident_management_oncall_participants, :is_removed
     end
+  end
 end

db/structure.sql

@@ -13234,7 +13234,7 @@ CREATE TABLE incident_management_oncall_participants (
     user_id bigint NOT NULL,
     color_palette smallint NOT NULL,
     color_weight smallint NOT NULL,
-    is_removed boolean DEFAULT false
+    is_removed boolean DEFAULT false NOT NULL
 );
 
 CREATE SEQUENCE incident_management_oncall_participants_id_seq