Add exclusive map ownership and capacity-aware autoscaling creation

src/lib/server/autoscaling/ownership.ts

@@ -0,0 +1,25 @@
+import { db } from '../db/index.js';
+import { getServer } from '../fleet/servers.js';
+import { mapIdentity } from './snapshot.js';
+
+export function scalingOwner(game: string, mapSlug: string): string | null {
+    return (db().prepare('SELECT id FROM autoscaling_policies WHERE game=? AND map_slug=? AND owns_map=1').get(game, mapSlug) as { id: string } | undefined)?.id ?? null;
+}
+export function scalingOwnershipBlocker(server: string): string | null {
+    const identity = mapIdentity(getServer(server) ?? { name: server });
+    const owner = identity && scalingOwner(identity.game, identity.mapSlug);
+    return owner ? `Autoscaling manages this map. Pause its policy and settle pending work before changing the lineup: /autoscaling#${owner}` : null;
+}
+export function assertScalingOwnership(game: string, mapSlug: string, decisionId?: string): void {
+    const owner = scalingOwner(game, mapSlug);
+    if (!owner) { if (decisionId) throw new Error('Autoscaling no longer owns this map.'); return; }
+    if (decisionId && db().prepare('SELECT 1 FROM autoscaling_decisions WHERE id=? AND policy_id=? AND resolved=0 AND operation_id IS NULL').get(decisionId, owner)) return;
+    throw new Error(`Autoscaling manages this map. Pause its policy and settle pending work before changing the lineup: /autoscaling#${owner}`);
+}
+/** Operator cancellation is a policy pause, not a fresh scaling signal. */
+export function pauseScalingForOperation(operationId: string): void {
+    const row = db().prepare('SELECT policy_id FROM autoscaling_decisions WHERE operation_id=?').get(operationId) as { policy_id: string } | undefined;
+    if (!row) return;
+    db().prepare("UPDATE autoscaling_policies SET mode='off',revision=revision+1,paused_reason='Paused after operator cancellation.',updated_at=? WHERE id=?").run(new Date().toISOString(), row.policy_id);
+    db().prepare('UPDATE autoscaling_authorizations SET revoked_at=? WHERE policy_id=? AND claimed_at IS NULL').run(Date.now(), row.policy_id);
+}