feat: cleanup removal of old ssh plexer and logic

we also have added the necessary logic to auto prune ephemeral nodes because
headscale doesn't seem to automatically remove them. this change made use of a database
which is now stored in the persistent headplane directory.

app/server/db/pruner.ts

@@ -0,0 +1,58 @@
+import { eq, isNotNull } from 'drizzle-orm';
+import { LoaderFunctionArgs } from 'react-router';
+import { Machine } from '~/types';
+import log from '~/utils/log';
+import { LoadContext } from '..';
+import { ephemeralNodes } from './schema';
+
+export async function pruneEphemeralNodes({
+	context,
+	request,
+}: LoaderFunctionArgs<LoadContext>) {
+	const session = await context.sessions.auth(request);
+	const ephemerals = await context.db
+		.select()
+		.from(ephemeralNodes)
+		.where(isNotNull(ephemeralNodes.node_key));
+
+	if (ephemerals.length === 0) {
+		log.debug('api', 'No ephemeral nodes to prune');
+		return;
+	}
+
+	const { nodes } = await context.client.get<{ nodes: Machine[] }>(
+		'v1/node',
+		session.get('api_key')!,
+	);
+
+	const toPrune = nodes.filter((node) => {
+		if (node.online) {
+			return false;
+		}
+
+		return ephemerals.some((ephemeral) => node.nodeKey === ephemeral.node_key);
+	});
+
+	if (toPrune.length === 0) {
+		log.debug('api', 'No SSH nodes to prune');
+		return;
+	}
+
+	// Delete from the Headscale nodes list and then from the database
+	const promises = toPrune.map((node) => {
+		return async () => {
+			log.info('api', `Pruning node ${node.name}`);
+			await context.client.delete(
+				`v1/node/${node.id}`,
+				session.get('api_key')!,
+			);
+
+			await context.db
+				.delete(ephemeralNodes)
+				.where(eq(ephemeralNodes.node_key, node.nodeKey));
+			log.info('api', `Node ${node.name} pruned successfully`);
+		};
+	});
+
+	await Promise.all(promises.map((p) => p()));
+}