CREATE TABLE IF NOT EXISTS vehicle_open_hydrogen_segment_stream_state (
    vin VARCHAR(64) NOT NULL,
    stat_date DATE NOT NULL,
    source_endpoint VARCHAR(128) NOT NULL DEFAULT '',
    finalized_consumption_kg DECIMAL(18,3) NOT NULL DEFAULT 0,
    projected_consumption_kg DECIMAL(18,3) NOT NULL DEFAULT 0,
    sample_count BIGINT UNSIGNED NOT NULL DEFAULT 0,
    refuel_count INT UNSIGNED NOT NULL DEFAULT 0,
    abnormal_drop_count INT UNSIGNED NOT NULL DEFAULT 0,
    eligible_interval_count BIGINT UNSIGNED NOT NULL DEFAULT 0,
    qualified_segment_count INT UNSIGNED NOT NULL DEFAULT 0,
    last_mass_kg DECIMAL(18,3) NOT NULL DEFAULT 0,
    last_event_time DATETIME(3) NOT NULL,
    last_event_id VARCHAR(128) NOT NULL DEFAULT '',
    state_json JSON NOT NULL,
    calculation_method VARCHAR(48) NOT NULL DEFAULT 'PRESSURE_NIST_SEGMENT_MEDIAN_5',
    quality_status VARCHAR(24) NOT NULL DEFAULT 'NO_DATA',
    quality_reason VARCHAR(255) NOT NULL DEFAULT '有效工作段关键帧不足10条',
    created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
    PRIMARY KEY (vin, stat_date),
    INDEX idx_hydrogen_segment_stream_date_quality (stat_date, quality_status, vin),
    CONSTRAINT chk_hydrogen_segment_stream_quality CHECK (quality_status IN ('OK', 'NO_DATA', 'SUSPECT'))
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;