Delete row sig_b1f8c8a4744f from signals

id sig_b1f8c8a4744f
event_id evt_92bedd230d60
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_6a080be9e ...
dedupe_key signal_enriched:market_headline_delta:708dc112a2b9 ...
throttle_s 0
created_at 2026-04-09T21:31:26.358018+00:00
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