Delete row sig_0b9ff4c50bab from signals

id sig_0b9ff4c50bab
event_id evt_b9cd20897022
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_6bad9a3f5 ...
dedupe_key signal_enriched:news_delta:684429694b1f757f
throttle_s 0
created_at 2026-04-19T19:30:21.859755+00:00
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