refactor: use xorm's TableInfo to resolve table names

Use engine.TableInfo(bean) instead of manually checking the TableName
interface and falling back to the mapper. This delegates all table name
resolution to xorm's own logic.

pkg/db/db.go

@@ -21,7 +21,6 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
-	"reflect"
 	"runtime"
 	"strconv"
 	"strings"
@@ -59,14 +58,13 @@ func RegisterTables(tables []interface{}) {
 
 // RegisteredTableNames returns the table names of all registered Vikunja tables.
 func RegisteredTableNames() []string {
-	mapper := x.GetTableMapper()
 	tableNames := make([]string, 0, len(registeredTables)+1)
 	for _, bean := range registeredTables {
-		if tn, ok := bean.(interface{ TableName() string }); ok {
-			tableNames = append(tableNames, tn.TableName())
-		} else {
-			tableNames = append(tableNames, mapper.Obj2Table(reflect.Indirect(reflect.ValueOf(bean)).Type().Name()))
+		tableInfo, err := x.TableInfo(bean)
+		if err != nil {
+			log.Fatalf("Could not get table info for bean: %v", err)
 		}
+		tableNames = append(tableNames, tableInfo.Name)
 	}
 	// The xormigrate migration tracking table is not registered via GetTables()
 	tableNames = append(tableNames, "migration")