Delete row sig_674211490429 from signals

id sig_674211490429
event_id evt_993704616550
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_72de06290 ...
dedupe_key signal_enriched:market_headline_delta:5dc8b51d8c0b ...
throttle_s 0
created_at 2026-04-19T09:01:04.842611+00:00
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