Add configurable server destruction concurrency

src/lib/server/db/fleet-settings.ts

@@ -5,14 +5,22 @@ export const FLEET_SETTINGS_KEY = 'fleet_settings';
 
 /** Import legacy environment values once; persisted settings win on every later boot. */
 export function initializeFleetSettings(handle: Database.Database): void {
-    if (handle.prepare('SELECT 1 FROM settings WHERE key = ?').get(FLEET_SETTINGS_KEY)) return;
+    const saved = handle.prepare('SELECT value FROM settings WHERE key = ?').get(FLEET_SETTINGS_KEY) as { value: string } | undefined;
+    if (saved) {
+        const settings = JSON.parse(saved.value);
+        if (!Object.hasOwn(settings, 'destroyConcurrency')) {
+            const upgraded = validateFleetSettings({ ...settings, destroyConcurrency: defaultFleetSettings.destroyConcurrency });
+            handle.prepare('UPDATE settings SET value = ? WHERE key = ?').run(JSON.stringify(upgraded), FLEET_SETTINGS_KEY);
+        }
+        return;
+    }
     const values = { ...defaultFleetSettings };
-    const legacy: Record<keyof FleetSettings, string> = {
+    const legacy: Partial<Record<keyof FleetSettings, string>> = {
         deployKeepDays: 'DEPLOY_KEEP_DAYS', restartConcurrency: 'DEPLOYMENT_RESTART_CONCURRENCY',
         createConcurrency: 'DEPLOYMENT_CREATE_CONCURRENCY'
     };
     for (const key of Object.keys(legacy) as (keyof FleetSettings)[]) {
-        const raw = process.env[legacy[key]];
+        const raw = process.env[legacy[key]!];
         if (raw) values[key] = Number(raw);
     }
     handle.prepare('INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)')