Fix rebuild generation reconciliation (Refs #155)

tests/unit/retention.test.ts

@@ -710,3 +710,35 @@ it.each(['cancelled', 'failed'])(
         ).toEqual({ history_expired_at: expect.any(String) });
     }
 );
+
+it('retains completed rebuild evidence when a stale job binding hid an unreconciled generation', async () => {
+    const a = await api();
+    const hosts = await import('../../src/lib/server/hosts/index.js');
+    const host = hosts.createHost({ name: 'Host' });
+    a.db
+        .prepare(
+            "INSERT INTO native_instances(id,server,host_id,generation,library_id,image,port,created_at) VALUES('instance','s',?,2,'lib','image',1,?)"
+        )
+        .run(host.id, old);
+    a.db
+        .prepare(
+            "INSERT INTO server_deployments(id,server,action,state,stage,started_at,finished_at,triggered_by) VALUES('cancelled','s','rebuild','cancelled','cancelled',?,?,'test')"
+        )
+        .run(old, old);
+    const command = hosts.queueHostOperation(
+        host.id,
+        'instance.rebuild',
+        { nextGeneration: 3 },
+        { instanceId: 'instance', generation: 2 }
+    );
+    hosts.reportHostOperation(host.id, command.id, { state: 'completed' });
+    a.db
+        .prepare(
+            "INSERT INTO native_provisioning(deployment_id,instance_id,generation,operation_id,applied_at) VALUES('cancelled','instance',1,?,?)"
+        )
+        .run(command.id, old);
+    a.saveFleetSettings({ ...a.fleetSettings(), provisioningKeepDays: 1, historyKeepCount: 0 });
+    expect(a.pruneHistory('provisioning')).toBe(0);
+    a.db.prepare("UPDATE native_instances SET generation=3 WHERE id='instance'").run();
+    expect(a.pruneHistory('provisioning')).toBe(1);
+});