Delete row sig_37f37665c781 from signals

id sig_37f37665c781
event_id evt_3a94bab8f687
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T02:09:51.085036+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:04c105df17da5443
throttle_s 0
created_at 2026-04-19T02:09:51.085036+00:00
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