Alter {users,job_definitions}.id to bigint

There is the problem that some tables has different type of primary key from
its installed:

- before 0.2.0: using unsigned int for primary key
- after 0.2.0: using signed int for primary key

This problem was made by fa75b20.

This makes hard to keep consistency of code / infra.
For instance, we need to care about 2 types of primary when adding foreign key.
Actually, this is already blocker of cookpad#110

To solve the problem, this patch proposes to alter these primary key to
bigint, which is next default type of rails.

db/migrate/033_alter_key_and_index_to_bigint.rb

@@ -0,0 +1,37 @@
+class AlterKeyAndIndexToBigInt < ActiveRecord::Migration[5.0]
+  def up
+    change_column :job_definitions, :id, :bigint, null: false
+    change_column :admin_assignments, :job_definition_id, :bigint, null: false
+    change_column :execution_histories, :job_definition_id, :bigint, null: false
+    change_column :executions, :job_definition_id, :bigint, null: false
+    change_column :job_definition_tags, :job_definition_id, :bigint, null: false
+    change_column :job_instances, :job_definition_id, :bigint, null: false
+    change_column :job_schedules, :job_definition_id, :bigint, null: false
+    change_column :job_suspend_schedules, :job_definition_id, :bigint, null: false
+    change_column :memory_expectancies, :job_definition_id, :bigint, null: false
+    change_column :stars, :job_definition_id, :bigint, null: false
+    change_column :tokens, :job_definition_id, :bigint, null: false
+
+    change_column :users, :id, :bigint, null: false
+    change_column :admin_assignments, :user_id, :bigint, null: false
+    change_column :stars, :user_id, :bigint, null: false
+  end
+
+  def down
+    change_column :job_definitions, :id, :int, unsigned: true, null: false
+    change_column :admin_assignments, :job_definition_id, :int, unsigned: true, null: false
+    change_column :execution_histories, :job_definition_id, :int, unsigned: true, null: false
+    change_column :executions, :job_definition_id, :int, unsigned: true, null: false
+    change_column :job_definition_tags, :job_definition_id, :int, unsigned: true, null: false
+    change_column :job_instances, :job_definition_id, :int, unsigned: true, null: false
+    change_column :job_schedules, :job_definition_id, :int, unsigned: true, null: false
+    change_column :job_suspend_schedules, :job_definition_id, :int, unsigned: true, null: false
+    change_column :memory_expectancies, :job_definition_id, :int, unsigned: true, null: false
+    change_column :stars, :job_definition_id, :int, unsigned: true, null: false
+    change_column :tokens, :job_definition_id, :int, unsigned: true, null: false
+
+    change_column :users, :id, :int, unsigned: true, null: false
+    change_column :admin_assignments, :user_id, :int, unsigned: true, null: false
+    change_column :stars, :user_id, :int, unsigned: true, null: false
+  end
+end