Delete row sig_9ec4f9aa1925 from signals

id sig_9ec4f9aa1925
event_id evt_aaa5c67bc6cc
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_d1bdc6dc3 ...
dedupe_key signal_enriched:news_delta:11c18ae16760178a
throttle_s 0
created_at 2026-04-20T12:32:35.111604+00:00
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