Delete row sig_8489df6c69ef from signals

id sig_8489df6c69ef
event_id evt_dd154d16127d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T04:30:38.452568+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:87ea12526f466f41
throttle_s 0
created_at 2026-04-07T04:30:38.452568+00:00
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