Delete row sig_2fce4b754463 from signals

id sig_2fce4b754463
event_id evt_69e1e3a7500b
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_68c1af832 ...
dedupe_key signal_enriched:news_delta:300e0726e8abc77e
throttle_s 0
created_at 2026-04-06T21:50:13.347738+00:00
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