Delete row sig_b4fa038b43bb from signals

id sig_b4fa038b43bb
event_id evt_4afcbdcd4870
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T22:35:33.690454+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:9dfb48724d605357
throttle_s 0
created_at 2026-04-10T22:35:33.690454+00:00
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