docs: Add how-to guide for creating expired session cleanup script

docs/docs/guides/how-to/expired-session-cleanup/index.md

@@ -0,0 +1,49 @@
+---
+title: 'Expired Session Cleanup'
+---
+
+# Expired Session Cleanup
+
+As noted in [SessionService](/reference/typescript-api/services/session-service), sessions are not automatically deleted when expired. This means that if you have a large number of sessions, you may need to clean them up periodically to avoid clogging up your database.
+
+This guide aims to demonstrate how to create [Stand-alone CLI Scripts](/guides/developer-guide/stand-alone-scripts/) to automate the process of cleaning up expired sessions.
+
+## Code
+
+This code bootstraps the Vendure Worker, then retrieves the `SessionService` and calls the `cleanupExpiredSessions` method on it, completely removing all expired sessions from the database. It can be easily run from the command-line or scheduled to run periodically.
+
+```ts title="src/expired-session-cleanup.ts"
+import { bootstrapWorker, Logger, SessionService, RequestContextService } from '@vendure/core';
+import { config } from './vendure-config';
+
+const loggerCtx = 'ExpiredSessionCleanup';
+
+if (require.main === module) {
+    cleanupExpiredSessions()
+        .then(() => process.exit(0))
+        .catch(err => {
+            Logger.error(err, loggerCtx);
+            process.exit(1);
+        });
+}
+
+async function cleanupExpiredSessions() {
+    Logger.info('Session cleanup started.', loggerCtx);
+
+    // Bootstrap an instance of the Vendure Worker
+    const { app } = await bootstrapWorker(config);
+
+    // Retrieve the SessionService
+    const sessionService = app.get(SessionService);
+
+    // Create a RequestContext for administrative tasks
+    const ctx = await app.get(RequestContextService).create({
+        apiType: 'admin',
+    });
+
+    // Call the cleanup function
+    await sessionService.cleanupExpiredSessions(ctx);
+
+    Logger.info('Session cleanup completed.', loggerCtx);
+}
+```