Delete row sig_2f152937f5bf from signals

id sig_2f152937f5bf
event_id evt_4e922530acf9
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_0ed33f6aa ...
dedupe_key signal_enriched:news_delta:aeebf773b3f5e844
throttle_s 0
created_at 2026-04-18T17:12:31.874305+00:00
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