add TODO about tracking song play moment

diff --git a/TODO.txt b/TODO.txt
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+* song/artist/album repetition after a long pause
+
+  After a long pause in the player, it becomes possible to add to the playlist
+  a song that was played recently, even if it was added to the playlist
+  sufficiently long ago.
+
+  For example 'Song' by 'Artist' is added to the playlist. Then the player is
+  paused for more than the 'min-album-interval'. At this point it is possible
+  that a new song by 'Artist' is added to the playlist, which would cause
+  artist repetition on playback.
+
+  The fix would be to project song play moment and use that for the DB
+  queries. That would require keeping player state, including the playlist.
+  Also, song duration needs to be part of the database. Song last play time
+  needs to be stored in DB.
+
+
+# vim: set ai tw=78 :