Delete row sig_9f7ea53256f8 from signals

id sig_9f7ea53256f8
event_id evt_af7946d879c9
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_0d8938672 ...
dedupe_key signal_enriched:news_delta:0f780ce324624853
throttle_s 0
created_at 2026-04-20T07:27:55.151540+00:00
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