Delete row sig_131a9f1003c2 from signals

id sig_131a9f1003c2
event_id evt_429c020aa2fa
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_adc265d78 ...
dedupe_key signal_enriched:market_headline_delta:fa5d9b4e8352 ...
throttle_s 0
created_at 2026-04-20T20:05:38.169913+00:00
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