CREATE TABLE lead_import_jobs (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    batch_id VARCHAR(64) NOT NULL,
    line_number INT UNSIGNED NULL,
    lead_id BIGINT UNSIGNED NULL,
    lead_created TINYINT(1) NOT NULL DEFAULT 0,
    status ENUM('pending','processing','failed','completed') NOT NULL DEFAULT 'pending',
    attempts INT UNSIGNED NOT NULL DEFAULT 0,
    max_attempts INT UNSIGNED NOT NULL DEFAULT 3,
    available_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    started_at DATETIME NULL,
    finished_at DATETIME NULL,
    error_message TEXT NULL,
    payload LONGTEXT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    INDEX idx_lead_import_jobs_status_available (status, available_at),
    INDEX idx_lead_import_jobs_batch (batch_id),
    INDEX idx_lead_import_jobs_lead (lead_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;