diff --git a/db/migrate/20190910115511_create_rsa_public_keys.rb b/db/migrate/20190910115511_create_rsa_public_keys.rb
deleted file mode 100644
index 54f81a1..0000000
--- a/db/migrate/20190910115511_create_rsa_public_keys.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-class CreateRSAPublicKeys < ActiveRecord::Migration[6.0]
-  include Partynest::Migration
-
-  def change
-    create_table :rsa_public_keys do |t|
-      t.timestamps null: false
-
-      t.text    :pem,  null: false
-      t.integer :bits, null: false
-
-      t.index :pem, unique: true
-    end
-
-    constraint :rsa_public_keys, :bits, <<~SQL
-      bits in (2048, 4096)
-    SQL
-  end
-end
diff --git a/db/migrate/20190910133430_create_x509_certificate_requests.rb b/db/migrate/20190910133430_create_x509_certificate_requests.rb
deleted file mode 100644
index 914fa1c..0000000
--- a/db/migrate/20190910133430_create_x509_certificate_requests.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-class CreateX509CertificateRequests < ActiveRecord::Migration[6.0]
-  include Partynest::Migration
-
-  def change
-    create_table :x509_certificate_requests do |t|
-      t.timestamps null: false
-
-      t.references :rsa_public_key, null: false, foreign_key: true
-
-      t.string :distinguished_name, null: false
-      t.text   :pem,                null: false
-    end
-
-    constraint :x509_certificate_requests, :distinguished_name, <<~SQL
-      is_good_big_text(distinguished_name)
-    SQL
-  end
-end
diff --git a/db/migrate/20190910225118_create_x509_certificates.rb b/db/migrate/20190910225118_create_x509_certificates.rb
deleted file mode 100644
index aef1ef5..0000000
--- a/db/migrate/20190910225118_create_x509_certificates.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-class CreateX509Certificates < ActiveRecord::Migration[6.0]
-  def change
-    create_table :x509_certificates do |t|
-      t.timestamps null: false
-
-      t.references :x509_certificate_request, null: true, foreign_key: true
-
-      t.text :pem, null: false
-
-      t.datetime :not_before
-      t.datetime :not_after
-    end
-  end
-end
diff --git a/db/migrate/20190911081459_create_x509_tables.rb b/db/migrate/20190911081459_create_x509_tables.rb
new file mode 100644
index 0000000..5ddcdf4
--- /dev/null
+++ b/db/migrate/20190911081459_create_x509_tables.rb
@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+class CreateX509Tables < ActiveRecord::Migration[6.0]
+  include Partynest::Migration
+
+  def change
+    create_table :rsa_public_keys do |t|
+      t.timestamps null: false
+
+      t.text    :pem,  null: false
+      t.integer :bits, null: false
+
+      t.index :pem, unique: true
+    end
+
+    constraint :rsa_public_keys, :bits, <<~SQL
+      bits in (2048, 4096)
+    SQL
+
+    create_table :x509_certificate_requests do |t|
+      t.timestamps null: false
+
+      t.references :rsa_public_key, null: false, foreign_key: true
+
+      t.string :distinguished_name, null: false
+      t.text   :pem,                null: false
+    end
+
+    constraint :x509_certificate_requests, :distinguished_name, <<~SQL
+      is_good_big_text(distinguished_name)
+    SQL
+
+    create_table :x509_certificates do |t|
+      t.timestamps null: false
+
+      t.references :x509_certificate_request, null: true, foreign_key: true
+
+      t.text :pem, null: false
+
+      t.datetime :not_before
+      t.datetime :not_after
+    end
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index 00789cf..f1dfbd0 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -1704,8 +1704,6 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20181129203927'),
 ('20181130024918'),
 ('20190910040709'),
-('20190910115511'),
-('20190910133430'),
-('20190910225118');
+('20190911081459');