Delete row sig_4f2c81369ce4 from signals

id sig_4f2c81369ce4
event_id evt_b345b1faa7ca
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_93fc8fc19 ...
dedupe_key signal_enriched:news_delta:6eba8c0a0341d705
throttle_s 0
created_at 2026-04-18T19:32:52.142607+00:00
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