1 files changed, 16 insertions, 0 deletions
diff --git a/internal/feed/cache/v1.go b/internal/feed/cache/v1.go
index 0363303..5675db5 100644
--- a/internal/feed/cache/v1.go
+++ b/internal/feed/cache/v1.go
@@ -23,6 +23,7 @@ const (
 	v1Version    Version = 1
 	startFeedId  uint64  = 1
 	maxCacheSize         = 1000
+	maxCacheDays         = 180
 )
 
 type feedId uint64
@@ -376,6 +377,21 @@ func filterItems(items []cachedItem) []cachedItem {
 	return copiedItems
 }
 
+func (cache *v1Cache) cleanup(knownDescriptors map[feed.Descriptor]bool) {
+	for descr, id := range cache.Ids {
+		if knownDescriptors[descr] {
+			// do not delete stuff still known to us
+			continue
+		}
+
+		cf := cache.Feeds[id]
+		if cf.LastCheck.IsZero() || util.Days(time.Since(cf.LastCheck)) > maxCacheDays {
+			delete(cache.Feeds, id)
+			delete(cache.Ids, descr)
+		}
+	}
+}
+
 func (cache *v1Cache) load(reader io.Reader) error {
 	decoder := gob.NewDecoder(reader)
 	return decoder.Decode(cache)