fix(postgres): check if source exists before creating

Signed-off-by: soxx <soxx@fenpa.ws>

internal/postgres/source.go

@@ -16,7 +16,7 @@ func CreateSourceNode(ctx context.Context, db *gorm.DB, anthroveSource *pgModels
 		return fmt.Errorf("anthroveSource domain is required")
 	}
 
-	result := db.WithContext(ctx).Create(anthroveSource)
+	result := db.WithContext(ctx).Where(pgModels.Source{Domain: anthroveSource.Domain}).FirstOrCreate(anthroveSource)
 
 	if result.Error != nil {
 		return result.Error

internal/postgres/source_test.go

@@ -65,7 +65,7 @@ func TestCreateSourceNode(t *testing.T) {
 				db:             gormDB,
 				anthroveSource: validAnthroveSource,
 			},
-			wantErr: true,
+			wantErr: false,
 		},
 	}
 	for _, tt := range tests {
@@ -249,7 +249,7 @@ func checkSourceNode(got *pgModels.Source, want *pgModels.Source) bool {
 	if want == nil && got == nil {
 		return true
 	}
-	
+
 	if got.Domain != want.Domain {
 		return false
 	}