max(created_at)+equality-join returned both rows when two like events shared
an identical created_at (realistic: likes carry a client-supplied timestamp
from offline sync), double-counting the track. Replace with DISTINCT ON
(track_id) + deterministic tiebreaker (created_at desc, id desc) across
get_latest_state / liked-tracks / count.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Цвылев Александр Вадимович
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