i/server/migrations/0016_vehicle_current_km.sql

-- 0016_vehicle_current_km.sql — 车辆当前里程（手动校准）
-- 真实里程 = MAX(current_km, MAX(odometer_km) FROM 各日志表)
-- 用户可以手动覆盖 current_km（比如仪表盘数与日志对不上时）
ALTER TABLE vehicles
    ADD COLUMN current_km INT DEFAULT NULL COMMENT '手动校准的当前里程，NULL 时按各日志表 MAX 算';

-- 保险提示阈值（可被 settings 覆盖）
CREATE TABLE IF NOT EXISTS notification_prefs (
    key_name     VARCHAR(50)  NOT NULL PRIMARY KEY,
    days         INT          NOT NULL,
    enabled      TINYINT(1)   NOT NULL DEFAULT 1,
    updated_at   DATETIME     NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

INSERT INTO notification_prefs (key_name, days, enabled) VALUES
    ('refuel_remind_days', 30, 1),
    ('maintenance_remind_days', 180, 1),
    ('wash_remind_days', 14, 1)
ON DUPLICATE KEY UPDATE updated_at = NOW();

-- 站内通知表（OCR / 同步 / 备份结果持久化）
CREATE TABLE IF NOT EXISTS notifications (
    id          INT AUTO_INCREMENT PRIMARY KEY,
    user_id     INT          DEFAULT NULL,
    type        VARCHAR(30)  NOT NULL,    -- ocr_done / sync_done / backup_done / system
    title       VARCHAR(200) NOT NULL,
    body        TEXT         DEFAULT NULL,
    link        VARCHAR(500) DEFAULT NULL,
    severity    VARCHAR(20)  NOT NULL DEFAULT 'info',  -- info / warn / error / success
    is_read     TINYINT(1)   NOT NULL DEFAULT 0,
    created_at  DATETIME     NOT NULL DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_notif_user_unread  (user_id, is_read, created_at DESC),
    INDEX idx_notif_created      (created_at DESC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;