Restore command (#593)

Add waiting for changes to config file

Add max size for config files

Restore files

Restore database file

Expose migrate to

Move init stuff to seperate package

Add restoring config file

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/593

pkg/db/db.go

@@ -168,3 +168,20 @@ func initSqliteEngine() (engine *xorm.Engine, err error) {
 
 	return xorm.NewEngine("sqlite3", path)
 }
+
+// WipeEverything wipes all tables and their data. Use with caution...
+func WipeEverything() error {
+
+	tables, err := x.DBMetas()
+	if err != nil {
+		return err
+	}
+
+	for _, t := range tables {
+		if err := x.DropTables(t.Name); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}