diff --git a/db/migrate/20190921161613_create_relation_transitions.rb b/db/migrate/20190921161613_create_relation_transitions.rb
deleted file mode 100644
index aad20c9..0000000
--- a/db/migrate/20190921161613_create_relation_transitions.rb
+++ /dev/null
@@ -1,31 +0,0 @@
-# frozen_string_literal: true
-
-class CreateRelationTransitions < ActiveRecord::Migration[6.0]
-  include Partynest::Migration
-
-  def change
-    create_table :relation_transitions do |t|
-      t.timestamps null: false
-
-      t.references :from_status,
-                   null: true,
-                   foreign_key: { to_table: :relation_statuses }
-
-      t.references :to_status,
-                   null: false,
-                   foreign_key: { to_table: :relation_statuses }
-
-      t.string :name, null: false, index: { unique: true }
-
-      t.index %i[from_status_id to_status_id], unique: true
-    end
-
-    add_constraint :relation_transitions, :name, <<~SQL
-      is_good_small_text(name)
-    SQL
-
-    add_constraint :relation_transitions, :statuses, <<~SQL
-      from_status_id != to_status_id
-    SQL
-  end
-end
diff --git a/db/migrate/20191001211809_unique_index_statuses_on_relation_transitions.rb b/db/migrate/20191001211809_unique_index_statuses_on_relation_transitions.rb
deleted file mode 100644
index bec7f5b..0000000
--- a/db/migrate/20191001211809_unique_index_statuses_on_relation_transitions.rb
+++ /dev/null
@@ -1,25 +0,0 @@
-# frozen_string_literal: true
-
-class UniqueIndexStatusesOnRelationTransitions < ActiveRecord::Migration[6.0]
-  def change
-    reversible do |dir|
-      dir.down do
-        execute <<~SQL
-          DROP INDEX
-            index_relation_transitions_on_to_status_id_when_from_status_id_is_null
-        SQL
-      end
-
-      dir.up do
-        execute <<~SQL
-          CREATE UNIQUE INDEX
-            index_relation_transitions_on_to_status_id_when_from_status_id_is_null
-            ON relation_transitions
-            USING btree
-            (to_status_id)
-            WHERE from_status_id IS NULL;
-        SQL
-      end
-    end
-  end
-end
diff --git a/db/migrate/20191002113932_remove_relation_transitions.rb b/db/migrate/20191002113932_remove_relation_transitions.rb
deleted file mode 100644
index 79a4c15..0000000
--- a/db/migrate/20191002113932_remove_relation_transitions.rb
+++ /dev/null
@@ -1,51 +0,0 @@
-# frozen_string_literal: true
-
-class RemoveRelationTransitions < ActiveRecord::Migration[6.0]
-  include Partynest::Migration
-
-  def change
-    remove_constraint :relation_transitions, :name, <<~SQL
-      is_good_small_text(name)
-    SQL
-
-    remove_constraint :relation_transitions, :statuses, <<~SQL
-      from_status_id != to_status_id
-    SQL
-
-    reversible do |dir|
-      dir.up do
-        execute <<~SQL
-          DROP INDEX
-            index_relation_transitions_on_to_status_id_when_from_status_id_is_null
-        SQL
-      end
-
-      dir.down do
-        execute <<~SQL
-          CREATE UNIQUE INDEX
-            index_relation_transitions_on_to_status_id_when_from_status_id_is_null
-            ON relation_transitions
-            USING btree
-            (to_status_id)
-            WHERE from_status_id IS NULL;
-        SQL
-      end
-    end
-
-    drop_table :relation_transitions do |t|
-      t.timestamps null: false
-
-      t.references :from_status,
-                   null: true,
-                   foreign_key: { to_table: :relation_statuses }
-
-      t.references :to_status,
-                   null: false,
-                   foreign_key: { to_table: :relation_statuses }
-
-      t.string :name, null: false, index: { unique: true }
-
-      t.index %i[from_status_id to_status_id], unique: true
-    end
-  end
-end
diff --git a/db/structure.sql b/db/structure.sql
index ee527a9..a92558d 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -1880,7 +1880,6 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20181130024918'),
 ('20190910040709'),
 ('20190921142404'),
-('20190921161613'),
 ('20190921191213'),
 ('20190928171705'),
 ('20190929131544'),
@@ -1889,9 +1888,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20190930210852'),
 ('20190930215223'),
 ('20191001022049'),
-('20191001211809'),
 ('20191002002101'),
-('20191002113932'),
 ('20191002170727');