FIX (wal): Allow to save error via /complete endpoint

backend/internal/features/backups/backups/controllers/postgres_wal_controller.go

@@ -222,6 +222,14 @@ func (c *PostgreWalBackupController) CompleteFullBackupUpload(ctx *gin.Context)
 		return
 	}
 
+	if request.Error == nil && (request.StartSegment == "" || request.StopSegment == "") {
+		ctx.JSON(
+			http.StatusBadRequest,
+			gin.H{"error": "startSegment and stopSegment are required when no error is provided"},
+		)
+		return
+	}
+
 	if err := c.walService.FinalizeBasebackup(
 		database,
 		request.BackupID,

backend/internal/features/backups/backups/dto/dto.go

@@ -84,7 +84,7 @@ type UploadBasebackupResponse struct {
 
 type FinalizeBasebackupRequest struct {
 	BackupID     uuid.UUID `json:"backupId"     binding:"required"`
-	StartSegment string    `json:"startSegment" binding:"required"`
-	StopSegment  string    `json:"stopSegment"  binding:"required"`
+	StartSegment string    `json:"startSegment"`
+	StopSegment  string    `json:"stopSegment"`
 	Error        *string   `json:"error"`
 }