Remove unnecessary migrations

db/migrate/20190911081459_create_x509_tables.rb

@@ -1,53 +0,0 @@
-# frozen_string_literal: true
-
-class CreateX509Tables < ActiveRecord::Migration[6.0]
-  include Partynest::Migration
-
-  def change
-    create_table :asymmetric_keys do |t|
-      t.timestamps null: false
-      t.string :type, null: false
-      t.index %i[type id], unique: true
-
-      t.references :account, foreign_key: true
-
-      t.text   :public_key_pem, null: false
-      t.binary :public_key_der, null: false
-
-      t.binary :private_key_pem_iv
-      t.binary :private_key_pem_ciphertext
-
-      t.boolean :has_password, null: false
-      t.string  :sha1,         null: false
-      t.string  :sha256,       null: false
-
-      t.integer :bits
-      t.string  :curve
-
-      t.index :public_key_pem, unique: true
-      t.index :public_key_der, unique: true
-      t.index :sha1,           unique: true
-      t.index :sha256,         unique: true
-    end
-
-    add_constraint :asymmetric_keys, :bits, <<~SQL
-      bits IS NULL OR bits IN (2048, 4096)
-    SQL
-
-    add_constraint :asymmetric_keys, :curve, <<~SQL
-      curve IS NULL OR curve IN ('prime256v1', 'secp384r1')
-    SQL
-
-    create_table :x509_certificates do |t|
-      t.timestamps null: false
-
-      t.references :asymmetric_key, null: false, foreign_key: true
-
-      t.text     :pem,        null: false
-      t.string   :subject,    null: false
-      t.string   :issuer,     null: false
-      t.datetime :not_before, null: false
-      t.datetime :not_after,  null: false
-    end
-  end
-end

db/migrate/20190915085803_allow_null_has_password_on_asymmetric_keys.rb

@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-
-class AllowNullHasPasswordOnAsymmetricKeys < ActiveRecord::Migration[6.0]
-  def change
-    reversible do |dir|
-      dir.up do
-        change_column :asymmetric_keys, :has_password, :boolean, null: true
-      end
-      dir.down do
-        change_column :asymmetric_keys, :has_password, :boolean, null: false
-      end
-    end
-  end
-end

db/migrate/20190915131325_drop_x509_tables.rb

@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-class DropX509Tables < ActiveRecord::Migration[6.0]
-  def change
-    drop_table :x509_certificates
-    drop_table :asymmetric_keys
-  end
-end

db/structure.sql

@@ -1611,9 +1611,6 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20181129203927'),
 ('20181130024918'),
 ('20190910040709'),
-('20190911081459'),
-('20190915085803'),
-('20190915131325'),
 ('20190921142404'),
 ('20190921161613'),
 ('20190921191213'),