fixing constraint name

dbcon/postgresql.go

@@ -359,7 +359,7 @@ func generateSQLFromStorage(tableName string, columnAndValues interface{}) strin
 						argName = val
 					}
 				}
-				argName = fmt.Sprintf("constraint %s_%s", keysName, argName)
+				argName = fmt.Sprintf("constraint %s_%s", strings.Replace(keysName, " ", "_", 1), argName)
 			}
 		}