Add sequential_id to calculate auto incrementing submission id

db/migrate/20200412165834_add_sequential_id_to_submissions.rb

@@ -0,0 +1,5 @@
+class AddSequentialIdToSubmissions < ActiveRecord::Migration[6.0]
+  def change
+    add_column :submissions, :sequential_id, :integer
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_04_09_001610) do
+ActiveRecord::Schema.define(version: 2020_04_12_165834) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -63,6 +63,7 @@ ActiveRecord::Schema.define(version: 2020_04_09_001610) do
     t.datetime "updated_at", precision: 6, null: false
     t.string "remote_ip"
     t.string "referrer"
+    t.integer "sequential_id"
   end
 
   create_table "users", force: :cascade do |t|