Delete row sig_bb47c9664249 from signals

id sig_bb47c9664249
event_id evt_f7b5219b841e
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_b78ce869f ...
dedupe_key signal_enriched:news_delta:dc5d301750c357a8
throttle_s 0
created_at 2026-04-09T23:03:22.692074+00:00
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