Delete row sig_4e3183bb19e4 from signals

id sig_4e3183bb19e4
event_id evt_077707e95958
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_ce3134810 ...
dedupe_key signal_enriched:news_delta:fdfb1aa4aa37b6aa
throttle_s 0
created_at 2026-04-07T05:08:56.611380+00:00
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