Delete row sig_9ffa6780b8c6 from signals

id sig_9ffa6780b8c6
event_id evt_b01a78a595d4
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_c272c46b9 ...
dedupe_key signal_enriched:news_delta:214ac7e5802e04aa
throttle_s 0
created_at 2026-04-17T20:17:18.524552+00:00
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