Delete row sig_4ad76b2158b3 from signals

id sig_4ad76b2158b3
event_id evt_ea3bccd1dcb8
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_6e405021d ...
dedupe_key signal_enriched:news_delta:6b04bfa6ec6d3551
throttle_s 0
created_at 2026-04-21T22:00:08.707483+00:00
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