Delete row sig_dc960f5fed1a from signals

id sig_dc960f5fed1a
event_id evt_458fcb5847bf
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_67f93a46d ...
dedupe_key signal_enriched:news_delta:13f411cf08c9b947
throttle_s 0
created_at 2026-04-17T16:09:34.348953+00:00
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