Delete row sig_bb5b07787031 from signals

id sig_bb5b07787031
event_id evt_3432bfb98e6e
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_2ae7a3770 ...
dedupe_key signal_enriched:news_delta:bc1c56f402687b94
throttle_s 0
created_at 2026-04-09T00:07:15.558263+00:00
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