fix: Makes created and updated by nullable strings for library panel migration (#108122)

Signed-off-by: Bruno Abrantes <bruno@brunoabrantes.com>

pkg/registry/apis/dashboard/legacy/sql_dashboards.go

@@ -489,10 +489,10 @@ type panel struct {
 	FolderUID sql.NullString
 
 	Created   time.Time
-	CreatedBy string
+	CreatedBy sql.NullString
 
 	Updated   time.Time
-	UpdatedBy string
+	UpdatedBy sql.NullString
 
 	Version int64
 
@@ -633,13 +633,13 @@ func parseLibraryPanelRow(p panel) (dashboardV0.LibraryPanel, error) {
 	if p.FolderUID.Valid {
 		meta.SetFolder(p.FolderUID.String)
 	}
-	meta.SetCreatedBy(p.CreatedBy)
+	meta.SetCreatedBy(getUserID(p.CreatedBy, sql.NullInt64{}))
 	meta.SetGeneration(p.Version)
 	meta.SetDeprecatedInternalID(p.ID) //nolint:staticcheck
 
 	// Only set updated metadata if it is different
-	if p.UpdatedBy != p.CreatedBy || p.Updated.Sub(p.Created) > time.Second {
+	if p.UpdatedBy.Valid && p.Updated.Sub(p.Created) > time.Second {
-		meta.SetUpdatedBy(p.UpdatedBy)
+		meta.SetUpdatedBy(getUserID(p.UpdatedBy, sql.NullInt64{}))
 		meta.SetUpdatedTimestamp(&p.Updated)
 	}
 

pkg/registry/apis/dashboard/legacy/sql_dashboards_test.go

@@ -230,9 +230,9 @@ func TestParseLibraryPanelRow(t *testing.T) {
 		UID:         "panel-uid",
 		FolderUID:   sql.NullString{String: "folder-uid", Valid: true},
 		Created:     time.Now(),
-		CreatedBy:   "creator",
+		CreatedBy:   sql.NullString{String: "creator", Valid: true},
 		Updated:     time.Now(),
-		UpdatedBy:   "updator",
+		UpdatedBy:   sql.NullString{String: "updator", Valid: true},
 		Version:     2,
 		Type:        "graph",
 		Description: "desc from db",
@@ -261,6 +261,8 @@ func TestParseLibraryPanelRow(t *testing.T) {
 	t.Run("metadata is set correctly", func(t *testing.T) {
 		p := basePanel
 		p.Name = "Test Panel"
+		// Ensure there's a time difference greater than 1 second to trigger updated metadata
+		p.Updated = p.Created.Add(2 * time.Second)
 		model := map[string]interface{}{
 			"title":       "Test Panel",
 			"type":        "graph",
@@ -278,8 +280,8 @@ func TestParseLibraryPanelRow(t *testing.T) {
 		require.Equal(t, p.ID, meta.GetDeprecatedInternalID()) // nolint:staticcheck
 		require.Equal(t, p.Version, meta.GetGeneration())
 		require.Equal(t, p.FolderUID.String, meta.GetFolder())
-		require.Equal(t, p.CreatedBy, meta.GetCreatedBy())
+		require.Equal(t, "user:creator", meta.GetCreatedBy())
-		require.Equal(t, p.UpdatedBy, meta.GetUpdatedBy())
+		require.Equal(t, "user:updator", meta.GetUpdatedBy())
 	})
 
 	t.Run("panel title in dashboard vs library panel title is set correctly", func(t *testing.T) {
@@ -300,4 +302,66 @@ func TestParseLibraryPanelRow(t *testing.T) {
 		require.Equal(t, "Model Title", item.Spec.PanelTitle)
 		require.Equal(t, "Database Name", item.Spec.Title)
 	})
+
+	t.Run("handles NULL created_by and updated_by fields", func(t *testing.T) {
+		p := basePanel
+		p.Name = "Test Panel"
+		// Set CreatedBy and UpdatedBy to NULL (Invalid)
+		p.CreatedBy = sql.NullString{String: "", Valid: false}
+		p.UpdatedBy = sql.NullString{String: "", Valid: false}
+		model := map[string]interface{}{
+			"title":       "Test Panel",
+			"type":        "graph",
+			"description": "desc from db",
+		}
+		modelBytes, err := json.Marshal(model)
+		require.NoError(t, err)
+		p.Model = modelBytes
+
+		item, err := parseLibraryPanelRow(p)
+		require.NoError(t, err)
+
+		meta, err := utils.MetaAccessor(&item)
+		require.NoError(t, err)
+
+		// When CreatedBy is NULL, it should be set to empty string
+		require.Equal(t, "", meta.GetCreatedBy())
+
+		// When UpdatedBy is NULL and not valid, updated metadata should not be set
+		require.Equal(t, "", meta.GetUpdatedBy())
+		// The updated timestamp should not be set when UpdatedBy is invalid
+		updatedTimestamp, err := meta.GetUpdatedTimestamp()
+		require.NoError(t, err)
+		require.Nil(t, updatedTimestamp)
+	})
+
+	t.Run("handles valid created_by but NULL updated_by", func(t *testing.T) {
+		p := basePanel
+		p.Name = "Test Panel"
+		p.CreatedBy = sql.NullString{String: "creator", Valid: true}
+		p.UpdatedBy = sql.NullString{String: "", Valid: false}
+		// Make sure there's a time difference to trigger the update logic
+		p.Updated = p.Created.Add(10 * time.Second)
+		model := map[string]interface{}{
+			"title":       "Test Panel",
+			"type":        "graph",
+			"description": "desc from db",
+		}
+		modelBytes, err := json.Marshal(model)
+		require.NoError(t, err)
+		p.Model = modelBytes
+
+		item, err := parseLibraryPanelRow(p)
+		require.NoError(t, err)
+
+		meta, err := utils.MetaAccessor(&item)
+		require.NoError(t, err)
+
+		require.Equal(t, "user:creator", meta.GetCreatedBy())
+		// Even with time difference, if UpdatedBy is not valid, updated metadata should not be set
+		require.Equal(t, "", meta.GetUpdatedBy())
+		updatedTimestamp, err := meta.GetUpdatedTimestamp()
+		require.NoError(t, err)
+		require.Nil(t, updatedTimestamp)
+	})
 }