Delete row sig_5b1c1272a89e from signals

id sig_5b1c1272a89e
event_id evt_9e8b3a58a3d7
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_60269602e ...
dedupe_key signal_enriched:news_delta:0af4205cda94bc7c
throttle_s 0
created_at 2026-04-09T00:07:15.913908+00:00
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