Delete row sig_279ade9be256 from signals

id sig_279ade9be256
event_id evt_1d62e80e63fd
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_020d9dd1b ...
dedupe_key signal_enriched:news_delta:4e960f8e0ae21d7b
throttle_s 0
created_at 2026-04-22T14:03:33.997076+00:00
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