Delete row sig_37572095b779 from signals

id sig_37572095b779
event_id evt_8e9b929fdc55
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_383cd3442 ...
dedupe_key signal_enriched:market_headline_delta:d5717b5e7e3a ...
throttle_s 0
created_at 2026-04-18T16:34:28.177541+00:00
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