Delete row sig_3d3df29cc122 from signals

id sig_3d3df29cc122
event_id evt_55f065e1117d
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_517ca85eb ...
dedupe_key signal_enriched:news_delta:31dbeb030558fe5f
throttle_s 0
created_at 2026-04-20T22:09:14.687388+00:00
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