Delete row sig_db4e9dbe7778 from signals

id sig_db4e9dbe7778
event_id evt_9375a491470d
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_00cb272b7 ...
dedupe_key signal_enriched:news_delta:1059c1aa88c48801
throttle_s 0
created_at 2026-04-18T18:42:00.523819+00:00
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