✨ Fully rewrite relay

src/commands/close.ts

@@ -0,0 +1,15 @@
+import type { UserConnection } from '../UserConnection.ts';
+import { log } from '../utils/logs.ts';
+
+export function handleClose(
+  connection: UserConnection,
+  subscriptionId: string,
+) {
+  if (!connection.subscriptions.has(subscriptionId)) {
+    return log.warn(
+      `Closing unknown subscription? That's weird. Subscription ID: ${subscriptionId}`,
+    );
+  }
+
+  connection.subscriptions.delete(subscriptionId);
+}