Add safe manual instance rebalancing

src/lib/server/db/index.ts

@@ -12,6 +12,7 @@ import { migrateServerHistory } from './server-history.js';
 import { migrateNativeInstances } from '../backends/schema.js';
 import { migrateServerKeys } from './server-keys.js';
 import { ensureAutoscalingSchema } from '../autoscaling/schema.js';
+import { ensureRebalancingSchema } from '../rebalancing/schema.js';
 import { installPerformanceIndexes } from './performance-indexes.js';
 import { migrateFileBlobs } from './file-blobs.js';
 import { enableIncrementalVacuum, retentionClocks } from './retention-clocks.js';
@@ -402,6 +403,7 @@ export function db(): Database.Database {
         migrationStep('native instance schema and file plans', () => migrateNativeInstances(handle));
         migrationStep('per-game server key pools', () => migrateServerKeys(handle));
         migrationStep('autoscaling schema', () => ensureAutoscalingSchema(handle));
+        migrationStep('rebalancing schema', () => ensureRebalancingSchema(handle));
         // File-blob migration removes the legacy content column altogether.
         // Reordering it first would unnecessarily copy every artifact twice.
         migrateFileBlobs(handle);