Delete row sig_a8b1ba197d74 from signals

id sig_a8b1ba197d74
event_id evt_f1bb5acae064
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_4987b4abb ...
dedupe_key signal_enriched:news_delta:1d108392cd00dc1d
throttle_s 0
created_at 2026-04-09T16:31:19.632446+00:00
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