Phase G2-1~G2-6: Code Execution Worker - Docker sandbox deployment, backend API (code_exec_admin.py), frontend CodeExecTab, security hardening (read-only FS, non-root, capability dropping, RLIMIT_AS)

migrations/mig_code_exec.sql

@@ -0,0 +1,23 @@
+-- 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';