Delete row sig_fb1861bc11a9 from signals

id sig_fb1861bc11a9
event_id evt_cebb748ca707
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_e33fd2fc4 ...
dedupe_key signal_enriched:news_delta:a57120d60080b105
throttle_s 0
created_at 2026-04-09T11:22:54.937650+00:00
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