FEATURE: new site setting suggested_topics_max_days_old

config/locales/server.en.yml

@@ -1036,6 +1036,7 @@ en:
 
     suggested_topics: "Number of suggested topics shown at the bottom of a topic."
     limit_suggested_to_category: "Only show topics from the current category in suggested topics."
+    suggested_topics_max_days_old: "Suggested topics should not be more than n days old."
 
     clean_up_uploads: "Remove orphan unreferenced uploads to prevent illegal hosting. WARNING: you may want to back up of your /uploads directory before enabling this setting."
     clean_orphan_uploads_grace_period_hours: "Grace period (in hours) before an orphan upload is removed."

config/site_settings.yml

@@ -77,6 +77,10 @@ basic:
     min: 0
   limit_suggested_to_category:
     default: false
+  suggested_topics_max_days_old:
+    default: 365
+    min: 7
+    max: 10000
   track_external_right_clicks:
     client: true
     default: false