Delete row sig_9fe92f7e1dbd from signals

id sig_9fe92f7e1dbd
event_id evt_6156673425b5
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_77bfcd006 ...
dedupe_key signal_enriched:news_delta:ed5e2a5bebc55af5
throttle_s 0
created_at 2026-04-07T00:26:15.836613+00:00
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