Moved some code around and updated the README

persistent_data.go

@@ -0,0 +1,21 @@
+// Copyright (c) 2024 Julian Müller (ChaoticByte)
+
+package main
+
+import (
+	"time"
+)
+
+type PersistentData struct {
+	// {endpoint id 1: time last published, endpoint id 2: ..., ...}
+	LastPublished map[string]time.Time `json:"last_published"`
+}
+
+func NewPersistentData(c Config) PersistentData {
+	// Initial persistent data
+	d := PersistentData{LastPublished: map[string]time.Time{}}
+	for _, e := range apiEndpoints {
+		d.LastPublished[e.Id] = time.Now().Add(-time.Hour * 24) // a day ago
+	}
+	return d
+}