fix: move v2 pkgs (#1331)

* fix: move eventstore pkgs

* fix: move eventstore pkgs

* fix: remove v2 view

* fix: remove v2 view

internal/eventstore/repository/unique_constraint.go

@@ -0,0 +1,29 @@
+package repository
+
+//UniqueCheck represents all information about a unique attribute
+type UniqueConstraint struct {
+	//UniqueField is the field which should be unique
+	UniqueField string
+
+	//UniqueType is the type of the unique field
+	UniqueType string
+
+	//Action defines if unique constraint should be added or removed
+	Action UniqueConstraintAction
+
+	//ErrorMessage is the message key which should be returned if constraint is violated
+	ErrorMessage string
+}
+
+type UniqueConstraintAction int32
+
+const (
+	UniqueConstraintAdd UniqueConstraintAction = iota
+	UniqueConstraintRemoved
+
+	uniqueConstraintActionCount
+)
+
+func (f UniqueConstraintAction) Valid() bool {
+	return f >= 0 && f < uniqueConstraintActionCount
+}