Delete row sig_0f94526c218c from signals

id sig_0f94526c218c
event_id evt_37f13aa277a4
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_4af8eb5e1 ...
dedupe_key signal_enriched:news_delta:34802a7cea10dfde
throttle_s 0
created_at 2026-04-20T10:15:21.892374+00:00
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