Delete row sig_638349837970 from signals

id sig_638349837970
event_id evt_bfcd607fecb0
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_bbab51113 ...
dedupe_key signal_enriched:market_headline_delta:8d117da7bf0a ...
throttle_s 0
created_at 2026-04-12T11:16:26.451561+00:00
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