Delete row sig_2f2f3c5ca4d3 from signals

id sig_2f2f3c5ca4d3
event_id evt_b556df15fb72
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_184558a88 ...
dedupe_key signal_enriched:news_delta:657a252848cbc198
throttle_s 0
created_at 2026-04-09T21:31:27.092568+00:00
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