-- Banban shared schema
-- Sources:
--   1. talkingq-url/mysql/init/01-init.sql
--   2. mini-program/database/init.sql
-- Target database: talkingq
--
-- Notes:
--   1. talkingq-url base tables are kept as the device-domain foundation.
--   2. mini-program business tables are merged into the same database.
--   3. device_auth.device_id is the shared device identity key.
--   4. Device <-> AI conversation records remain in
--      conversation_histories / conversation_messages.
--   5. The database owner is shared, but table ownership is explicit:
--      talkingq-url owns device-domain base tables; mini-program owns
--      parent/child/binding/im/location extension tables.
--   6. During migration to the shared database, talkingq-url data in
--      `talkingq` is the source of truth. Legacy `mini_program` data is
--      not merged into `talkingq`.

CREATE DATABASE IF NOT EXISTS `talkingq`
  DEFAULT CHARACTER SET utf8mb4
  COLLATE utf8mb4_unicode_ci;

USE `talkingq`;

-- ---------------------------------------------------------------------------
-- talkingq-url base tables
-- ---------------------------------------------------------------------------

CREATE TABLE IF NOT EXISTS `device_configs` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `device_id` VARCHAR(64) NOT NULL,
  `selected_role_key` VARCHAR(64) NOT NULL,
  `preferred_language` VARCHAR(10) NULL,
  `volume` INT NULL,
  `last_update_time` FLOAT NOT NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE INDEX `device_id_UNIQUE` (`device_id` ASC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `conversation_histories` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `device_id` VARCHAR(64) NOT NULL,
  `role_key` VARCHAR(64) NOT NULL,
  `last_interaction_time` FLOAT NOT NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `idx_device_id` (`device_id` ASC),
  INDEX `idx_role_key` (`role_key` ASC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `conversation_messages` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `conversation_id` INT NOT NULL,
  `is_user` TINYINT(1) NOT NULL DEFAULT 0,
  `content` TEXT NOT NULL,
  `timestamp` FLOAT NOT NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `idx_conversation_id` (`conversation_id` ASC),
  CONSTRAINT `fk_messages_conversation`
    FOREIGN KEY (`conversation_id`)
    REFERENCES `conversation_histories` (`id`)
    ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `roles` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `role_key` VARCHAR(64) NOT NULL,
  `name` VARCHAR(128) NOT NULL,
  `description` TEXT NULL,
  `content` TEXT NOT NULL,
  `default_language` VARCHAR(10) NULL,
  `asr_provider` VARCHAR(64) NULL,
  `llm_provider` VARCHAR(64) NULL,
  `tts_provider` VARCHAR(64) NULL,
  `competitive_llm_mode` TINYINT(1) NULL,
  `volcano_model_id` VARCHAR(64) NULL,
  `volcano_voice_type` VARCHAR(64) NULL,
  `tencent_voice_type` VARCHAR(64) NULL,
  `aliyun_voice_name` VARCHAR(64) NULL,
  `minimax_voice_id` VARCHAR(64) NULL,
  `url` VARCHAR(255) NULL,
  `homophones` JSON NULL,
  `enabled` TINYINT(1) NOT NULL DEFAULT 1,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE INDEX `role_key_UNIQUE` (`role_key` ASC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `role_languages` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `role_id` INT NOT NULL,
  `language_code` VARCHAR(10) NOT NULL,
  `name` VARCHAR(128) NULL,
  `content` TEXT NULL,
  `asr_provider` VARCHAR(64) NULL,
  `llm_provider` VARCHAR(64) NULL,
  `tts_provider` VARCHAR(64) NULL,
  `volcano_voice_type` VARCHAR(64) NULL,
  `tencent_voice_type` VARCHAR(64) NULL,
  `aliyun_voice_name` VARCHAR(64) NULL,
  `minimax_voice_id` VARCHAR(64) NULL,
  `url` VARCHAR(255) NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE INDEX `uix_role_language` (`role_id`, `language_code`),
  CONSTRAINT `fk_role_languages_role`
    FOREIGN KEY (`role_id`)
    REFERENCES `roles` (`id`)
    ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `device_auth` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `device_id` VARCHAR(64) NOT NULL,
  `serial_number` VARCHAR(64) NOT NULL,
  `batch_id` VARCHAR(20) NULL,
  `is_active` TINYINT(1) NOT NULL DEFAULT 1,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE INDEX `device_id_UNIQUE` (`device_id` ASC),
  INDEX `idx_batch_id` (`batch_id` ASC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `device_firmware_update` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `device_id` VARCHAR(64) NOT NULL,
  `serial_number` VARCHAR(64) NOT NULL,
  `mac_address` VARCHAR(512) NULL,
  `firmware_version` VARCHAR(64) NOT NULL,
  `update_status` VARCHAR(32) NOT NULL DEFAULT 'success',
  `progress` FLOAT NULL DEFAULT 0.0,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE INDEX `device_id_UNIQUE` (`device_id` ASC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `system_config` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `config_key` VARCHAR(128) NOT NULL,
  `config_value` TEXT NULL,
  `description` VARCHAR(255) NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE INDEX `config_key_UNIQUE` (`config_key` ASC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

INSERT INTO `device_configs` (`device_id`, `selected_role_key`, `preferred_language`, `last_update_time`)
VALUES ('default', 'assistant', 'zh', UNIX_TIMESTAMP())
ON DUPLICATE KEY UPDATE `selected_role_key` = `selected_role_key`;

INSERT INTO `system_config` (`config_key`, `config_value`, `description`)
VALUES
  ('latest_firmware_version', '1.0.0', '最新固件版本'),
  ('update_firmware_url', 'https://example.com/firmware/latest.bin', '固件更新URL')
ON DUPLICATE KEY UPDATE `config_value` = `config_value`;

INSERT INTO `roles` (`role_key`, `name`, `description`, `content`, `default_language`, `enabled`)
VALUES (
  'assistant',
  '智能助手',
  '默认智能助手角色',
  '你是一个友好的智能助手，乐于帮助用户解答问题。',
  'zh',
  1
)
ON DUPLICATE KEY UPDATE `role_key` = `role_key`;

-- ---------------------------------------------------------------------------
-- mini-program extension tables
-- ---------------------------------------------------------------------------

CREATE TABLE IF NOT EXISTS `parents` (
  `user_id` BIGINT NOT NULL AUTO_INCREMENT,
  `openid` VARCHAR(64) NOT NULL,
  `unionid` VARCHAR(64) NULL,
  `nickname` VARCHAR(64) NULL,
  `avatar_url` VARCHAR(255) NULL,
  `avatar_file_key` VARCHAR(255) NULL,
  `phone` VARCHAR(20) NULL,
  `status` TINYINT NOT NULL DEFAULT 1,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`user_id`),
  UNIQUE KEY `uq_parents_openid` (`openid`),
  KEY `idx_parents_unionid` (`unionid`),
  KEY `idx_parents_phone` (`phone`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `children` (
  `child_id` BIGINT NOT NULL AUTO_INCREMENT,
  `child_name` VARCHAR(32) NOT NULL,
  `child_gender` TINYINT NOT NULL DEFAULT 2,
  `child_birthday` DATE NULL,
  `status` TINYINT NOT NULL DEFAULT 1,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`child_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `parent_child_relations` (
  `id` BIGINT NOT NULL AUTO_INCREMENT,
  `user_id` BIGINT NOT NULL,
  `child_id` BIGINT NOT NULL,
  `relation_type` TINYINT NOT NULL DEFAULT 9,
  `is_primary` TINYINT(1) NOT NULL DEFAULT 0,
  `status` TINYINT NOT NULL DEFAULT 1,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  CONSTRAINT `uq_user_child` UNIQUE (`user_id`, `child_id`),
  KEY `idx_pcr_user_id` (`user_id`),
  KEY `idx_pcr_child_id` (`child_id`),
  CONSTRAINT `fk_pcr_user`
    FOREIGN KEY (`user_id`)
    REFERENCES `parents` (`user_id`)
    ON DELETE CASCADE,
  CONSTRAINT `fk_pcr_child`
    FOREIGN KEY (`child_id`)
    REFERENCES `children` (`child_id`)
    ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `device_bindings` (
  `id` BIGINT NOT NULL AUTO_INCREMENT,
  `device_id` VARCHAR(64) NOT NULL,
  `owner_user_id` BIGINT NOT NULL,
  `child_id` BIGINT NULL,
  `status` TINYINT NOT NULL DEFAULT 1,
  `bound_at` DATETIME NOT NULL,
  `unbound_at` DATETIME NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  CONSTRAINT `uq_device_binding_device` UNIQUE (`device_id`),
  CONSTRAINT `uq_device_binding_child` UNIQUE (`child_id`),
  KEY `idx_device_bindings_owner_user_id` (`owner_user_id`),
  CONSTRAINT `fk_device_bindings_device`
    FOREIGN KEY (`device_id`)
    REFERENCES `device_auth` (`device_id`),
  CONSTRAINT `fk_device_bindings_owner`
    FOREIGN KEY (`owner_user_id`)
    REFERENCES `parents` (`user_id`),
  CONSTRAINT `fk_device_bindings_child`
    FOREIGN KEY (`child_id`)
    REFERENCES `children` (`child_id`)
    ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `device_bind_sessions` (
  `id` BIGINT NOT NULL AUTO_INCREMENT,
  `bind_token` CHAR(36) NOT NULL,
  `device_id` VARCHAR(64) NOT NULL,
  `initiator_user_id` BIGINT NOT NULL,
  `target_child_id` BIGINT NULL,
  `challenge_code_hash` CHAR(64) NULL,
  `challenge_set_at` DATETIME NULL,
  `expires_at` DATETIME NOT NULL,
  `max_attempt_count` TINYINT UNSIGNED NOT NULL DEFAULT 5,
  `attempt_count` TINYINT UNSIGNED NOT NULL DEFAULT 0,
  `status` TINYINT NOT NULL DEFAULT 1,
  `confirmed_at` DATETIME NULL,
  `consumed_at` DATETIME NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `uq_device_bind_sessions_token` (`bind_token`),
  KEY `idx_device_bind_sessions_device_id` (`device_id`),
  KEY `idx_device_bind_sessions_initiator_user_id` (`initiator_user_id`),
  KEY `idx_device_bind_sessions_target_child_id` (`target_child_id`),
  KEY `idx_device_bind_sessions_expires_at` (`expires_at`),
  CONSTRAINT `fk_device_bind_sessions_device`
    FOREIGN KEY (`device_id`)
    REFERENCES `device_auth` (`device_id`),
  CONSTRAINT `fk_device_bind_sessions_initiator`
    FOREIGN KEY (`initiator_user_id`)
    REFERENCES `parents` (`user_id`),
  CONSTRAINT `fk_device_bind_sessions_target_child`
    FOREIGN KEY (`target_child_id`)
    REFERENCES `children` (`child_id`)
    ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `device_bind_history` (
  `id` BIGINT NOT NULL AUTO_INCREMENT,
  `device_id` VARCHAR(64) NOT NULL,
  `child_id` BIGINT NULL,
  `bound_by_user_id` BIGINT NOT NULL,
  `unbound_by_user_id` BIGINT NULL,
  `bind_source` TINYINT NOT NULL DEFAULT 1,
  `bound_at` DATETIME NOT NULL,
  `unbound_at` DATETIME NULL,
  `unbind_reason` VARCHAR(191) NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_device_bind_history_device_id` (`device_id`),
  KEY `idx_device_bind_history_child_id` (`child_id`),
  KEY `idx_device_bind_history_bound_by_user_id` (`bound_by_user_id`),
  KEY `idx_device_bind_history_unbound_by_user_id` (`unbound_by_user_id`),
  KEY `idx_device_bind_history_bound_at` (`bound_at`),
  CONSTRAINT `fk_device_bind_history_device`
    FOREIGN KEY (`device_id`)
    REFERENCES `device_auth` (`device_id`),
  CONSTRAINT `fk_device_bind_history_child`
    FOREIGN KEY (`child_id`)
    REFERENCES `children` (`child_id`)
    ON DELETE SET NULL,
  CONSTRAINT `fk_device_bind_history_bound_by`
    FOREIGN KEY (`bound_by_user_id`)
    REFERENCES `parents` (`user_id`),
  CONSTRAINT `fk_device_bind_history_unbound_by`
    FOREIGN KEY (`unbound_by_user_id`)
    REFERENCES `parents` (`user_id`)
    ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `cards` (
  `card_id` BIGINT NOT NULL AUTO_INCREMENT,
  `card_uuid` VARCHAR(64) NOT NULL,
  `device_id` VARCHAR(64) NULL,
  `card_name` VARCHAR(64) NULL,
  `status` TINYINT NOT NULL DEFAULT 0,
  `total_swaps` INT NOT NULL DEFAULT 0,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`card_id`),
  UNIQUE KEY `uq_cards_card_uuid` (`card_uuid`),
  UNIQUE KEY `uq_cards_device_id` (`device_id`),
  KEY `idx_cards_status` (`status`),
  CONSTRAINT `fk_cards_device`
    FOREIGN KEY (`device_id`)
    REFERENCES `device_auth` (`device_id`)
    ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Shared device volume is recommended to use device_configs.volume as source of truth.
-- device_settings.volume is retained for mini-program compatibility and UI storage.
CREATE TABLE IF NOT EXISTS `device_settings` (
  `setting_id` BIGINT NOT NULL AUTO_INCREMENT,
  `device_id` VARCHAR(64) NOT NULL,
  `sleep_mode` TINYINT NOT NULL DEFAULT 0,
  `disable_time_start` TIME NULL,
  `disable_time_end` TIME NULL,
  `timezone` VARCHAR(32) NOT NULL DEFAULT 'Asia/Shanghai',
  `volume` TINYINT UNSIGNED NULL,
  `brightness` TINYINT UNSIGNED NULL,
  `disable_weekdays` VARCHAR(32) NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`setting_id`),
  UNIQUE KEY `uq_device_settings_device_id` (`device_id`),
  CONSTRAINT `fk_device_settings_device`
    FOREIGN KEY (`device_id`)
    REFERENCES `device_auth` (`device_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `im_conversations` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `conversation_type` TINYINT UNSIGNED NOT NULL,
  `participant_a_type` TINYINT UNSIGNED NOT NULL,
  `participant_a_id` VARCHAR(64) NOT NULL,
  `participant_b_type` TINYINT UNSIGNED NOT NULL,
  `participant_b_id` VARCHAR(64) NOT NULL,
  `pair_key` VARCHAR(191) NOT NULL,
  `status` TINYINT NOT NULL DEFAULT 1,
  `last_seq` BIGINT UNSIGNED NOT NULL DEFAULT 0,
  `message_count` BIGINT UNSIGNED NOT NULL DEFAULT 0,
  `last_message_preview` VARCHAR(255) NULL,
  `last_message_at` DATETIME NULL,
  `ext_json` JSON NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  CONSTRAINT `uq_conv_type_pair` UNIQUE (`conversation_type`, `pair_key`),
  KEY `idx_im_conv_participant_a` (`participant_a_type`, `participant_a_id`),
  KEY `idx_im_conv_participant_b` (`participant_b_type`, `participant_b_id`),
  KEY `idx_im_conv_last_message_at` (`last_message_at`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `im_messages` (
  `id` BIGINT NOT NULL AUTO_INCREMENT,
  `conversation_id` BIGINT UNSIGNED NOT NULL,
  `seq` BIGINT UNSIGNED NOT NULL,
  `sender_type` TINYINT UNSIGNED NOT NULL,
  `sender_id` VARCHAR(64) NOT NULL,
  `receiver_type` TINYINT UNSIGNED NOT NULL,
  `receiver_id` VARCHAR(64) NOT NULL,
  `content_type` TINYINT UNSIGNED NOT NULL,
  `content_text` MEDIUMTEXT NULL,
  `content_json` JSON NULL,
  `media_file_key` VARCHAR(255) NULL,
  `media_duration_ms` INT UNSIGNED NULL,
  `media_mime_type` VARCHAR(64) NULL,
  `media_size_bytes` BIGINT UNSIGNED NULL,
  `media_transcript_text` TEXT NULL,
  `client_msg_id` VARCHAR(64) NULL,
  `sender_name_snapshot` VARCHAR(64) NULL,
  `sender_avatar_snapshot` VARCHAR(255) NULL,
  `receiver_name_snapshot` VARCHAR(64) NULL,
  `receiver_avatar_snapshot` VARCHAR(255) NULL,
  `ext_json` JSON NULL,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `deleted_at` DATETIME NULL,
  PRIMARY KEY (`id`),
  CONSTRAINT `uq_im_msg_conv_seq` UNIQUE (`conversation_id`, `seq`),
  CONSTRAINT `uq_im_msg_client` UNIQUE (`conversation_id`, `client_msg_id`),
  KEY `idx_im_msg_conversation_created_at` (`conversation_id`, `created_at`),
  KEY `idx_im_msg_sender` (`sender_type`, `sender_id`, `created_at`),
  KEY `idx_im_msg_receiver` (`receiver_type`, `receiver_id`, `created_at`),
  CONSTRAINT `fk_im_messages_conversation`
    FOREIGN KEY (`conversation_id`)
    REFERENCES `im_conversations` (`id`)
    ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `child_location_current` (
  `child_id` BIGINT NOT NULL,
  `device_id` VARCHAR(64) NOT NULL,
  `coord_type` VARCHAR(16) NOT NULL DEFAULT 'gcj02',
  `lat` DECIMAL(10, 7) NOT NULL,
  `lng` DECIMAL(10, 7) NOT NULL,
  `accuracy_m` INT UNSIGNED NULL,
  `altitude_m` DECIMAL(8, 2) NULL,
  `speed_mps` DECIMAL(8, 2) NULL,
  `heading_deg` SMALLINT UNSIGNED NULL,
  `source` TINYINT UNSIGNED NOT NULL,
  `battery_pct` TINYINT UNSIGNED NULL,
  `device_time` DATETIME NOT NULL,
  `server_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`child_id`),
  KEY `idx_child_loc_current_device` (`device_id`),
  KEY `idx_child_loc_current_server_time` (`server_time`),
  CONSTRAINT `fk_child_loc_current_child`
    FOREIGN KEY (`child_id`)
    REFERENCES `children` (`child_id`)
    ON DELETE CASCADE,
  CONSTRAINT `fk_child_loc_current_device`
    FOREIGN KEY (`device_id`)
    REFERENCES `device_auth` (`device_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `child_location_history` (
  `id` BIGINT NOT NULL AUTO_INCREMENT,
  `child_id` BIGINT NOT NULL,
  `device_id` VARCHAR(64) NOT NULL,
  `coord_type` VARCHAR(16) NOT NULL DEFAULT 'gcj02',
  `lat` DECIMAL(10, 7) NOT NULL,
  `lng` DECIMAL(10, 7) NOT NULL,
  `accuracy_m` INT UNSIGNED NULL,
  `altitude_m` DECIMAL(8, 2) NULL,
  `speed_mps` DECIMAL(8, 2) NULL,
  `heading_deg` SMALLINT UNSIGNED NULL,
  `source` TINYINT UNSIGNED NOT NULL,
  `battery_pct` TINYINT UNSIGNED NULL,
  `device_time` DATETIME NOT NULL,
  `server_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_child_loc_hist_child` (`child_id`, `created_at`),
  KEY `idx_child_loc_hist_device` (`device_id`, `created_at`),
  CONSTRAINT `fk_child_loc_hist_child`
    FOREIGN KEY (`child_id`)
    REFERENCES `children` (`child_id`)
    ON DELETE CASCADE,
  CONSTRAINT `fk_child_loc_hist_device`
    FOREIGN KEY (`device_id`)
    REFERENCES `device_auth` (`device_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;