Delete row sig_d3f2f0412e04 from signals

id sig_d3f2f0412e04
event_id evt_94c83c0bc9b8
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_6e7f6c8b3 ...
dedupe_key signal_enriched:news_delta:c287189c4e2ce9ac
throttle_s 0
created_at 2026-04-21T13:43:50.839546+00:00
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