implement a store abstraction

internal/ephemeral_store.go

@@ -0,0 +1,12 @@
+package internal
+
+// EphemeralStore loads an empty state and discards everything on save
+type EphemeralStore struct{}
+
+func (EphemeralStore) Load() (map[string]*FillerQueue, error) {
+	return make(map[string]*FillerQueue), nil
+}
+
+func (EphemeralStore) Save(map[string]*FillerQueue) error {
+	return nil
+}