Delete row sig_bb376fdeb80a from signals

id sig_bb376fdeb80a
event_id evt_0bead3c8cb82
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_5f891b1f1 ...
dedupe_key signal_enriched:news_delta:27ca6e433493b82f
throttle_s 0
created_at 2026-04-20T06:57:43.547515+00:00
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