docs: document activity bug

server/src/lib/activity/activity.ts

@@ -29,6 +29,12 @@ export type ActivityConstraint = FilterQuery<
  *
  * Optionally, startFrom can be passed, which will start this activity search from that
  * point in time.
+ *
+ * @bug - With the way `startFrom` works, its possible to "skip over" sessions that have
+ * the **exact** same timestamp, but didn't fall into the previous limit.
+ *
+ * for an array of imagined timestamps with sessions=3, followed by startFrom=3
+ * i.e. [1, 2, 3] 3, 3, 3 [4, 5, 6]
  */
 export async function GetRecentActivity(
 	// todo: is it possible to make this game agnostic?