Delete row sig_9666ae911778 from signals

id sig_9666ae911778
event_id evt_bf4489eddf47
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_e08db7c5c ...
dedupe_key signal_enriched:market_headline_delta:d06d050c7247 ...
throttle_s 0
created_at 2026-04-20T08:42:42.051669+00:00
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