Delete row sig_fbdacd199759 from signals

id sig_fbdacd199759
event_id evt_20812d9227e7
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_27805babe ...
dedupe_key signal_enriched:news_delta:6bdb6ed379bd0589
throttle_s 0
created_at 2026-04-18T00:54:59.243219+00:00
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