Delete row sig_3bfb84b777e4 from signals

id sig_3bfb84b777e4
event_id evt_be42c38a2c6b
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_5d8616fd6 ...
dedupe_key signal_enriched:news_delta:4ddb6cb1a84e90da
throttle_s 0
created_at 2026-04-20T12:47:45.337126+00:00
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