Delete row sig_5ad1c6ec608e from signals

id sig_5ad1c6ec608e
event_id evt_266f450e6cb1
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_9d40dbf49 ...
dedupe_key signal_enriched:news_delta:0d654f3270b9a52d
throttle_s 0
created_at 2026-04-20T08:58:44.382537+00:00
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