Delete row sig_f934016de302 from signals

id sig_f934016de302
event_id evt_d98a26060c2d
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_35eec1041 ...
dedupe_key signal_enriched:market_headline_delta:08cf5fdf032e ...
throttle_s 0
created_at 2026-04-17T19:38:46.531860+00:00
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