snapshot: Lock instances before making snapshot

internal/models/lock.go

@@ -0,0 +1,11 @@
+package models
+
+// LockTable is the name of the table the 'Metadatum' model is stored in.
+const LockTable = "locks"
+
+// Lock represents a log on WissKI Instances
+type Lock struct {
+	Pk uint `gorm:"column:pk;primaryKey"`
+
+	Slug string `gorm:"column:slug;not null"` // slug of instance
+}