Refactor code structure for improved readability and maintainability

server/lib/schema.js

@@ -19,6 +19,13 @@ async function createUsersTable() {
     }
 }
 
+async function ensureColumn(table, column, definition) {
+    const [columns] = await db.query(`SHOW COLUMNS FROM ${table} LIKE ?`, [column]);
+    if (columns.length === 0) {
+        await db.query(`ALTER TABLE ${table} ADD COLUMN ${definition}`);
+    }
+}
+
 async function createLicensesTable() {
     await db.query(`
         CREATE TABLE IF NOT EXISTS licenses (
@@ -33,11 +40,18 @@ async function createLicensesTable() {
             created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
             updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
             last_version_check_at DATETIME NULL,
+            last_used_version VARCHAR(64) NULL,
             primary_hostname VARCHAR(255) NULL,
             primary_hostname_normalized VARCHAR(255) NULL,
             FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
         ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
     `);
+
+    await ensureColumn(
+        "licenses",
+        "last_used_version",
+        "last_used_version VARCHAR(64) NULL AFTER last_version_check_at"
+    );
 }
 
 async function createLicenseHostnamesTable() {