Delete row sig_4b6f47c53372 from signals

id sig_4b6f47c53372
event_id evt_0579d67cae45
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-08T04:08:48.719782+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:5db4dd625a5ee7b2
throttle_s 0
created_at 2026-04-08T04:08:48.719782+00:00
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