-- G2: Code Execution Worker - Database Migration
-- Creates code_exec_tasks table for tracking code execution tasks

CREATE TABLE IF NOT EXISTS code_exec_tasks (
    id VARCHAR(36) NOT NULL PRIMARY KEY COMMENT 'Task ID (UUID short)',
    language VARCHAR(20) NOT NULL DEFAULT 'python' COMMENT 'Programming language',
    code_preview VARCHAR(500) DEFAULT '' COMMENT 'First 200 chars of code for preview',
    status ENUM('running','completed','error','failed','cancelled') NOT NULL DEFAULT 'running' COMMENT 'Execution status',
    timeout_sec INT NOT NULL DEFAULT 30 COMMENT 'Timeout in seconds',
    exit_code INT DEFAULT NULL COMMENT 'Process exit code',
    execution_time_ms FLOAT DEFAULT 0 COMMENT 'Execution time in milliseconds',
    stdout MEDIUMTEXT COMMENT 'Standard output (max 50KB)',
    stderr MEDIUMTEXT COMMENT 'Standard error (max 50KB)',
    error_msg VARCHAR(2048) DEFAULT NULL COMMENT 'Error message if failed',
    truncated TINYINT(1) NOT NULL DEFAULT 0 COMMENT 'Whether output was truncated',
    created_at DATETIME NOT NULL COMMENT 'Task creation time',
    completed_at DATETIME DEFAULT NULL COMMENT 'Task completion time',
    INDEX idx_language (language),
    INDEX idx_status (status),
    INDEX idx_created_at (created_at),
    INDEX idx_lang_status (language, status)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
COMMENT='Code execution task records';