Delete row sig_f608e3d2a5a5 from signals

id sig_f608e3d2a5a5
event_id evt_b266a95c6ce8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T03:46:07.294033+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4f554a9518c42274
throttle_s 0
created_at 2026-04-08T03:46:07.294033+00:00
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