diff --git a/core/structs.go b/core/structs.go
index 3162877..7e4dc09 100644
--- a/core/structs.go
+++ b/core/structs.go
@@ -12,6 +12,7 @@ package core
 
 import (
 	"net/url"
+	"reflect"
 	"sync"
 	"time"
 
@@ -90,6 +91,32 @@ func GofeedConvert(f *gofeed.Feed, title string) (*Feed, error) {
 	return new, nil
 }
 
+// InsertFeed will insert or update a core.Feed in a core.FullData
+func (d *FullData) InsertFeed(new *Feed, remote *url.URL) {
+	d.FeedsMu.Lock()
+	oldFeed, ok := d.Feeds[*remote]
+	if !ok || !reflect.DeepEqual(new, oldFeed) {
+		// Feeds are different, or there was never an old one
+		d.Feeds[*remote] = new
+		d.FeedsMu.Unlock()
+	} else {
+		d.FeedsMu.Unlock()
+	}
+}
+
+// InsertPage will insert or update a core.Page in a core.FullData
+func (d *FullData) InsertPage(new *Page, remote *url.URL) {
+	d.PagesMu.Lock()
+	_, ok := d.Pages[*remote]
+	if !ok || d.Pages[*remote].Hash != new.Hash {
+		// pages are different, or there was never an old one
+		d.Pages[*remote] = new
+		d.PagesMu.Unlock()
+	} else {
+		d.PagesMu.Unlock()
+	}
+}
+
 // Implement sort.Interface for Feed
 
 // Len returns the length of Items.