Delete row sig_3b7228c4abb1 from signals

id sig_3b7228c4abb1
event_id evt_a95a13cd8d1b
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_f434216e8 ...
dedupe_key signal_enriched:news_delta:3503ec846d072eb6
throttle_s 0
created_at 2026-04-18T17:12:32.562435+00:00
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