re-add timeframe-omit

app/models/calendar_event.rb

@@ -54,6 +54,10 @@ def private?
     @summary == "timeframe-private" || @description == "timeframe-private"
   end
 
+  def omit?
+    @description == "timeframe-omit"
+  end
+
   def start_i
     @starts_at.to_i
   end

app/models/calendar_feed.rb

@@ -52,7 +52,7 @@ def events_for(starts_at, ends_at, events = [], private_mode = false)
       else
         (event.start_i...event.end_i).overlaps?(starts_at.to_i...ends_at.to_i)
       end
-    end
+    end.select { !_1.omit? }
 
     # Merge duplicate events, merging the letter with a custom rule if so
     filtered_events = filtered_events.group_by { _1.id }

test/models/calendar_feed_test.rb

@@ -248,4 +248,23 @@ def test_filtering_private_events
       assert(CalendarFeed.new.events_for(start_time_utc, end_time_utc, calendar_events, true)[:periodic].length == 0)
     end
   end
+
+  def test_excludes_omit
+    calendar_events = [
+      CalendarEvent.new(
+        id: "foo",
+        starts_at: DateTime.new(2023, 8, 27, 15, 20, 0, "-0600"),
+        ends_at: DateTime.new(2023, 8, 27, 20, 20, 0, "-0600"),
+        summary: "Hide me!",
+        description: "timeframe-omit"
+      )
+    ]
+
+    travel_to DateTime.new(2023, 8, 27, 17, 20, 0, "-0600") do
+      start_time_utc = DateTime.new(2023, 8, 27, 0, 20, 0, "-0600").utc.to_time
+      end_time_utc = DateTime.new(2023, 8, 28, 0, 0, 0, "-0600").utc.to_time
+
+      assert(CalendarFeed.new.events_for(start_time_utc, end_time_utc, calendar_events)[:periodic].length == 0)
+    end
+  end
 end