Fix stop / start instance with network

cmd/api/api/instances_test.go

@@ -148,7 +148,7 @@ func TestInstanceLifecycle_StopStart(t *testing.T) {
 
 	// 1. Create instance
 	t.Log("Creating instance...")
-	networkEnabled := false
+	networkEnabled := true
 	createResp, err := svc.CreateInstance(ctx(), oapi.CreateInstanceRequestObject{
 		Body: &oapi.CreateInstanceRequest{
 			Name:  "test-lifecycle",

lib/network/allocate.go

@@ -27,8 +27,8 @@ func (m *manager) CreateAllocation(ctx context.Context, req AllocateRequest) (*N
 		return nil, fmt.Errorf("get default network: %w", err)
 	}
 
-	// 2. Check name uniqueness
-	exists, err := m.NameExists(ctx, req.InstanceName)
+	// 2. Check name uniqueness (exclude current instance to allow restarts)
+	exists, err := m.NameExists(ctx, req.InstanceName, req.InstanceID)
 	if err != nil {
 		return nil, fmt.Errorf("check name exists: %w", err)
 	}

lib/network/derive.go

@@ -113,14 +113,20 @@ func (m *manager) ListAllocations(ctx context.Context) ([]Allocation, error) {
 	return allocations, nil
 }
 
-// NameExists checks if instance name is already used in the default network
-func (m *manager) NameExists(ctx context.Context, name string) (bool, error) {
+// NameExists checks if instance name is already used in the default network.
+// excludeInstanceID allows excluding a specific instance from the check (used when
+// starting an existing instance to avoid it conflicting with itself).
+func (m *manager) NameExists(ctx context.Context, name string, excludeInstanceID string) (bool, error) {
 	allocations, err := m.ListAllocations(ctx)
 	if err != nil {
 		return false, err
 	}
 
 	for _, alloc := range allocations {
+		// Skip the excluded instance (e.g., when restarting an instance)
+		if excludeInstanceID != "" && alloc.InstanceID == excludeInstanceID {
+			continue
+		}
 		if alloc.InstanceName == name {
 			return true, nil
 		}

lib/network/manager.go

@@ -29,7 +29,7 @@ type Manager interface {
 	// Queries (derive from CH/snapshots)
 	GetAllocation(ctx context.Context, instanceID string) (*Allocation, error)
 	ListAllocations(ctx context.Context) ([]Allocation, error)
-	NameExists(ctx context.Context, name string) (bool, error)
+	NameExists(ctx context.Context, name string, excludeInstanceID string) (bool, error)
 
 	// GetUploadBurstMultiplier returns the configured multiplier for upload burst ceiling.
 	GetUploadBurstMultiplier() int