Add House Party Protocol for fleet-wide queued destruction

src/lib/server/fleet/create.ts

@@ -416,12 +416,16 @@ async function applyDeploymentTags(deployment: string, gameTagName: string, mapT
 const destroying = new Set<string>();
 
 // Persist the request before returning so navigation and client disconnects cannot lose it.
-export function destroyServer(name: string): DestroyServerResult & { deploymentId?: string } {
+function hasActiveCreation(name: string): boolean {
+    return !!db().prepare("SELECT 1 FROM server_deployments WHERE server = ? AND action = 'create' AND state IN ('queued', 'running', 'awaiting-health')").get(name);
+}
+
+export function destroyServer(name: string, triggeredBy = 'ui'): DestroyServerResult & { deploymentId?: string } {
     const existing = db().prepare("SELECT id FROM server_deployments WHERE server = ? AND action = 'destroy' AND state IN ('waiting', 'running')").get(name) as { id: string } | undefined;
     if (existing) return { ok: true, warnings: [], deploymentId: existing.id };
-    if (!getServer(name)) return { ok: false, kind: 'not-found', message: 'Server not found', warnings: [] };
+    if (!getServer(name) && !hasActiveCreation(name)) return { ok: false, kind: 'not-found', message: 'Server not found', warnings: [] };
     const operation = db().transaction(() => {
-        const id = beginDeployment(name, 'destroy');
+        const id = beginDeployment(name, 'destroy', triggeredBy);
         db().prepare("UPDATE server_deployments SET state = 'waiting' WHERE id = ?").run(id);
         deploymentStage(id, 'Waiting to verify the server is empty');
         return id;
@@ -443,6 +447,10 @@ async function runDestructions(): Promise<void> {
         destroying.add(operation.server);
         try {
             if (!getServer(operation.server)) {
+                if (hasActiveCreation(operation.server)) {
+                    deploymentStage(operation.id, 'Waiting for server creation to finish');
+                    continue;
+                }
                 finishDeployment(operation.id, { ok: false, message: 'Server is no longer registered' });
                 continue;
             }

src/lib/server/fleet/house-party.ts

@@ -0,0 +1,28 @@
+import { db } from '../db/index.js';
+import { destroyServer } from './create.js';
+
+export function housePartyTargets(): string[] {
+    return (db().prepare(`
+        SELECT name FROM servers WHERE destroyed_at IS NULL
+        UNION
+        SELECT server AS name FROM server_deployments
+        WHERE action = 'create' AND state IN ('queued', 'running', 'awaiting-health')
+        ORDER BY name
+    `).all() as { name: string }[]).map(row => row.name);
+}
+
+export function queueHouseParty(expectedServers: string[]) {
+    return db().transaction(() => {
+        const servers = housePartyTargets();
+        const expected = [...expectedServers].sort();
+        if (servers.length !== expected.length || servers.some((name, index) => name !== expected[index])) {
+            return { ok: false as const, error: 'The fleet changed. Refresh the preview and review the servers again.' };
+        }
+        const deployments = servers.map(server => {
+            const result = destroyServer(server, 'house-party-protocol');
+            if (!result.ok) throw new Error(result.message);
+            return { server, deploymentId: result.deploymentId! };
+        });
+        return { ok: true as const, deployments };
+    })();
+}