Delete row sig_d3dcfad2ed8d from signals

id sig_d3dcfad2ed8d
event_id evt_8960828dec6d
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_42c663f40 ...
dedupe_key signal_enriched:news_delta:7b7189c7e3f42669
throttle_s 0
created_at 2026-04-07T23:23:38.041482+00:00
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