fix: move v2 pkgs (#1331)

* fix: move eventstore pkgs

* fix: move eventstore pkgs

* fix: remove v2 view

* fix: remove v2 view

internal/eventstore/unique_constraint.go

@@ -0,0 +1,43 @@
+package eventstore
+
+type EventUniqueConstraint struct {
+	// UniqueType is the table name for the unique constraint
+	UniqueType string
+	//UniqueField is the unique key
+	UniqueField string
+	//Action defines if unique constraint should be added or removed
+	Action UniqueConstraintAction
+	//ErrorMessage defines the translation file key for the error message
+	ErrorMessage string
+}
+
+type UniqueConstraintAction int32
+
+const (
+	UniqueConstraintAdd UniqueConstraintAction = iota
+	UniqueConstraintRemove
+
+	uniqueConstraintActionCount
+)
+
+func NewAddEventUniqueConstraint(
+	uniqueType,
+	uniqueField,
+	errMessage string) *EventUniqueConstraint {
+	return &EventUniqueConstraint{
+		UniqueType:   uniqueType,
+		UniqueField:  uniqueField,
+		ErrorMessage: errMessage,
+		Action:       UniqueConstraintAdd,
+	}
+}
+
+func NewRemoveEventUniqueConstraint(
+	uniqueType,
+	uniqueField string) *EventUniqueConstraint {
+	return &EventUniqueConstraint{
+		UniqueType:  uniqueType,
+		UniqueField: uniqueField,
+		Action:      UniqueConstraintRemove,
+	}
+}