Delete row sig_4ac1fcc9bb5c from signals

id sig_4ac1fcc9bb5c
event_id evt_54fc73418cd1
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_8fb92d3d8 ...
dedupe_key signal_enriched:news_delta:47aafca5b7626d7d
throttle_s 0
created_at 2026-04-18T06:45:02.798003+00:00
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