Delete row sig_9fd1ff466b80 from signals

id sig_9fd1ff466b80
event_id evt_0bac77f983dd
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_64da6b28a ...
dedupe_key signal_enriched:news_delta:50aff8a727f0903b
throttle_s 0
created_at 2026-04-19T20:59:43.971090+00:00
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