Delete row sig_b0b842a9f678 from signals

id sig_b0b842a9f678
event_id evt_9f2acabc0829
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_3b7fe17f3 ...
dedupe_key signal_enriched:news_delta:0879ed47de1fb1a4
throttle_s 0
created_at 2026-04-21T02:24:00.081779+00:00
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