Delete row sig_3c25df3550bf from signals

id sig_3c25df3550bf
event_id evt_fae2ad98fbb3
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_1cb74ac93 ...
dedupe_key signal_enriched:news_delta:cf1b746f44bb4a8e
throttle_s 0
created_at 2026-04-17T12:37:32.490662+00:00
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