Delete row sig_3cbbf28a1837 from signals

id sig_3cbbf28a1837
event_id evt_b9b6aeb86eda
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_46b42fc7d ...
dedupe_key signal_enriched:news_delta:46dbe292bb04a877
throttle_s 0
created_at 2026-04-07T11:15:38.807677+00:00
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