fix: correctly unmarshal login names and metadata in user repository (#11775)

## Problem description

When calling `repository.UserRepository().Get(...)` the following error
got returned caused by scanning.

`Scan error: scanning: doing scan: scanFn: scany: scan row into struct
fields: sql: Scan error on column index 7, name "metadata": unsupported
Scan, storing driver.Value type []uint8 into type *[]*domain.Metadata`

## How the problem got solved

The issue was that json arrays were not properly unmarshalled during
scanning the rows into structs.

## Additional changes

The issue could also happen on login names, therefore it got fixed for
this field too. Other fields are not affected because we use
`json.RawMessage` for the specific user types.

## Additional information

Introduced in https://github.com/zitadel/zitadel/pull/10967

backend/v3/storage/database/repository/array.go

@@ -7,7 +7,7 @@ import (
 	"github.com/zitadel/zitadel/backend/v3/storage/database"
 )
 
-type JSONArray[T any] []*T
+type JSONArray[T any] []T
 
 var ErrScanSource = errors.New("unsupported scan source")
 

backend/v3/storage/database/repository/array_test.go

@@ -108,7 +108,7 @@ func TestJSONArray_Scan(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			var a repository.JSONArray[testObject]
+			var a repository.JSONArray[*testObject]
 			gotErr := a.Scan(tt.src)
 			require.ErrorIs(t, gotErr, tt.want.err)
 			require.Len(t, a, len(tt.want.res))

backend/v3/storage/database/repository/instance.go

@@ -270,7 +270,7 @@ func (i instance) UpdatedAtColumn() database.Column {
 
 type rawInstance struct {
 	*domain.Instance
-	Domains JSONArray[domain.InstanceDomain] `json:"domains,omitempty" db:"domains"`
+	Domains JSONArray[*domain.InstanceDomain] `json:"domains,omitempty" db:"domains"`
 }
 
 func scanInstance(ctx context.Context, querier database.Querier, builder *database.StatementBuilder) (*domain.Instance, error) {

backend/v3/storage/database/repository/org.go

@@ -297,8 +297,8 @@ func (o org) UpdatedAtColumn() database.Column {
 
 type rawOrg struct {
 	*domain.Organization
-	Domains  JSONArray[domain.OrganizationDomain]   `json:"domains,omitempty" db:"domains"`
-	Metadata JSONArray[domain.OrganizationMetadata] `json:"metadata,omitempty" db:"metadata"`
+	Domains  JSONArray[*domain.OrganizationDomain]   `json:"domains,omitempty" db:"domains"`
+	Metadata JSONArray[*domain.OrganizationMetadata] `json:"metadata,omitempty" db:"metadata"`
 }
 
 func scanOrganization(ctx context.Context, querier database.Querier, builder *database.StatementBuilder) (*domain.Organization, error) {

backend/v3/storage/database/repository/session.go

@@ -554,8 +554,8 @@ type rawSession struct {
 	Expiration *time.Time                         `json:"expiration" db:"expiration"`
 	UserID     *string                            `json:"userID" db:"user_id"`
 	CreatorID  *string                            `json:"creatorID" db:"creator_id"`
-	Factors    JSONArray[rawFactor]              `json:"factors,omitempty" db:"factors"`
-	Metadata   JSONArray[domain.SessionMetadata] `json:"metadata,omitempty" db:"metadata"`
+	Factors    JSONArray[*rawFactor]              `json:"factors,omitempty" db:"factors"`
+	Metadata   JSONArray[*domain.SessionMetadata] `json:"metadata,omitempty" db:"metadata"`
 }
 
 func scanSession(ctx context.Context, querier database.Querier, builder *database.StatementBuilder) (*domain.Session, error) {

backend/v3/storage/database/repository/user.go

@@ -353,6 +353,8 @@ type rawUser struct {
 	domain.User
 	Machine    *json.RawMessage            `json:"machine,omitempty" db:"machine"`
 	Human      *json.RawMessage            `json:"human,omitempty" db:"human"`
+	LoginNames JSONArray[domain.LoginName] `json:"loginNames,omitempty" db:"login_names"`
+	Metadata   JSONArray[*domain.Metadata] `json:"metadata,omitempty" db:"metadata"`
 }
 
 func (u *rawUser) toDomain() (*domain.User, error) {
@@ -367,6 +369,8 @@ func (u *rawUser) toDomain() (*domain.User, error) {
 			return nil, err
 		}
 	}
+	u.User.LoginNames = u.LoginNames
+	u.User.Metadata = u.Metadata
 	return &u.User, nil
 }
 

backend/v3/storage/database/repository/user_test.go

@@ -139,6 +139,15 @@ func Test_user_Get(t *testing.T) {
 			Name:        "My Machine",
 			Description: "This is my machine user",
 		},
+		Metadata: []*domain.Metadata{
+			{
+				InstanceID: instanceID,
+				Key:        "key",
+				Value:      []byte(`"something"`),
+				CreatedAt:  now,
+				UpdatedAt:  now,
+			},
+		},
 	}
 
 	err = userRepo.Create(t.Context(), tx, human)