active_record_time_default.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'

  gem 'activerecord', '6.0.0'
  gem 'sqlite3'
end

require 'active_record'
require 'logger'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.default_timezone = :local

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.time :woke_up_at, default: '07:00:00', null: false
  end
end

class User < ActiveRecord::Base
end

p User.create!

$ ruby active_record_time_default.rb
-- create_table(:users, {:force=>true})
D, [2019-12-16T18:42:32.205868 #75481] DEBUG -- :    (0.7ms)  SELECT sqlite_version(*)
D, [2019-12-16T18:42:32.206242 #75481] DEBUG -- :    (0.1ms)  DROP TABLE IF EXISTS "users"
D, [2019-12-16T18:42:32.207009 #75481] DEBUG -- :    (0.4ms)  CREATE TABLE "users" ("id" integer PRIMARY KEY AUTOINCREMENT NOT NULL, "woke_up_at" time DEFAULT '2000-01-01 07:00:00' NOT NULL)
   -> 0.0074s
D, [2019-12-16T18:42:32.242970 #75481] DEBUG -- :    (0.2ms)  CREATE TABLE "ar_internal_metadata" ("key" varchar NOT NULL PRIMARY KEY, "value" varchar, "created_at" datetime(6) NOT NULL, "updated_at" datetime(6) NOT NULL)
D, [2019-12-16T18:42:32.251669 #75481] DEBUG -- :   ActiveRecord::InternalMetadata Load (0.8ms)  SELECT "ar_internal_metadata".* FROM "ar_internal_metadata" WHERE "ar_internal_metadata"."key" = ? LIMIT ?  [["key", "environment"], ["LIMIT", 1]]
D, [2019-12-16T18:42:32.254338 #75481] DEBUG -- :    (0.0ms)  begin transaction
D, [2019-12-16T18:42:32.254638 #75481] DEBUG -- :   ActiveRecord::InternalMetadata Create (0.1ms)  INSERT INTO "ar_internal_metadata" ("key", "value", "created_at", "updated_at") VALUES (?, ?, ?, ?)  [["key", "environment"], ["value", "default_env"], ["created_at", "2019-12-16 18:42:32.254092"], ["updated_at", "2019-12-16 18:42:32.254092"]]
D, [2019-12-16T18:42:32.254814 #75481] DEBUG -- :    (0.0ms)  commit transaction
D, [2019-12-16T18:42:32.256819 #75481] DEBUG -- :    (0.0ms)  begin transaction
D, [2019-12-16T18:42:32.256982 #75481] DEBUG -- :   User Create (0.1ms)  INSERT INTO "users" DEFAULT VALUES
D, [2019-12-16T18:42:32.257209 #75481] DEBUG -- :    (0.0ms)  commit transaction
#<User id: 1, woke_up_at: 2000-01-01 07:00:00 +0900>