refactor: make intervals be string lists of aliases

models/interval.go

@@ -0,0 +1,12 @@
+package models
+
+type IntervalKey []string
+
+func (k *IntervalKey) HasAlias(s string) bool {
+	for _, e := range *k {
+		if e == s {
+			return true
+		}
+	}
+	return false
+}