fix: Add migration SQL files to repository

migrations/001_create_audit_logs.sql

@@ -0,0 +1,23 @@
+-- Migration: Create audit_logs table
+-- Description: Audit log untuk tracking semua perubahan data (create/update/delete)
+-- Date: 2024-12-28
+
+CREATE TABLE IF NOT EXISTS audit_logs (
+    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    actor_user_id INT UNSIGNED NOT NULL,
+    actor_username VARCHAR(100) NOT NULL,
+    actor_role VARCHAR(50) NOT NULL,
+    action VARCHAR(20) NOT NULL COMMENT 'create|update|delete',
+    entity VARCHAR(50) NOT NULL COMMENT 'locations|gates|tariffs',
+    entity_key VARCHAR(255) NOT NULL COMMENT 'Primary key atau composite key (e.g., "kerkof_01" or "kerkof_01:gate01")',
+    before_json JSON NULL COMMENT 'Data sebelum perubahan (untuk update/delete)',
+    after_json JSON NULL COMMENT 'Data sesudah perubahan (untuk create/update)',
+    ip_address VARCHAR(45) NOT NULL COMMENT 'IPv4 atau IPv6',
+    user_agent VARCHAR(500) NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    INDEX idx_actor_user_id (actor_user_id),
+    INDEX idx_entity (entity, entity_key),
+    INDEX idx_action (action),
+    INDEX idx_created_at (created_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+