Move WissKI Parts to new ingredients system

internal/wisski/ingredient/locker/locked.go

@@ -0,0 +1,15 @@
+package locker
+
+import "github.com/FAU-CDI/wisski-distillery/internal/models"
+
+// Locked checks if this WissKI is currently locked.
+func (lock *Locker) Locked() (locked bool) {
+	table, err := lock.SQL.QueryTable(true, models.LockTable)
+	if err != nil {
+		return false
+	}
+
+	// check if this instance is locked
+	table.Select("count(*) > 0").Where("slug = ?", lock.Slug).Find(&locked)
+	return
+}