Remove foreign key constraints referencing nodes table

Rakefile

@@ -64,6 +64,7 @@ namespace :db do
   desc "rollback one migration"
   task :rollback => :env do
     DB.with_connection do |c|
+      Foreigner.load
       ActiveRecord::Migrator.rollback('db/migrations')
     end
   end

db/migrations/014_remove_foreign_keys.rb

@@ -0,0 +1,15 @@
+class RemoveForeignKeys < ActiveRecord::Migration
+  def up
+    remove_foreign_key(:client_node_details, :nodes)
+    remove_foreign_key(:node_details, :nodes)
+    remove_foreign_key(:status_changes, :nodes)
+    remove_foreign_key(:nodes, name: 'nodes_parent_id_fk')
+  end
+
+  def down
+    add_foreign_key(:client_node_details, :nodes)
+    add_foreign_key(:node_details, :nodes)
+    add_foreign_key(:status_changes, :nodes)
+    add_foreign_key(:nodes, :nodes, column: 'parent_id')
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 11) do
+ActiveRecord::Schema.define(version: 14) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -38,24 +38,25 @@
   add_index "node_details", ["node_id"], name: "index_node_details_on_node_id", unique: true, using: :btree
 
   create_table "nodes", id: :uuid, default: "uuid_generate_v4()", force: true do |t|
-    t.string   "mode",                  null: false
-    t.string   "current_server_status", null: false
-    t.string   "current_client_status", null: false
-    t.string   "name",                  null: false
+    t.string   "mode",                                                                           null: false
+    t.string   "current_server_status",                                                          null: false
+    t.string   "current_client_status",                                                          null: false
+    t.string   "name",                                                                           null: false
     t.datetime "fires_at"
     t.uuid     "parent_id"
-    t.uuid     "workflow_id",           null: false
-    t.uuid     "user_id",               null: false
-    t.datetime "created_at",            null: false
-    t.datetime "updated_at",            null: false
-    t.integer  "seq",                   null: false
+    t.uuid     "workflow_id",                                                                    null: false
+    t.uuid     "user_id",                                                                        null: false
+    t.datetime "created_at",                                                                     null: false
+    t.datetime "updated_at",                                                                     null: false
+    t.integer  "seq",                   limit: 8, default: "nextval('nodes_seq_seq'::regclass)", null: false
     t.uuid     "parent_link_id"
   end
 
   add_index "nodes", ["fires_at"], name: "index_nodes_on_fires_at", using: :btree
   add_index "nodes", ["parent_id"], name: "index_nodes_on_parent_id", using: :btree
   add_index "nodes", ["parent_link_id"], name: "index_nodes_on_parent_link_id", using: :btree
   add_index "nodes", ["seq"], name: "index_nodes_on_seq", unique: true, using: :btree
+  add_index "nodes", ["workflow_id", "seq", "parent_id"], name: "index_nodes_on_workflow_id_and_seq_and_parent_id", using: :btree
   add_index "nodes", ["workflow_id"], name: "index_nodes_on_workflow_id", using: :btree
 
   create_table "status_changes", force: true do |t|