Delete row sig_b247bb85631b from signals

id sig_b247bb85631b
event_id evt_e0c1a3d20427
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_f5fc41f03 ...
dedupe_key signal_enriched:news_delta:2194ac1632ba1cb4
throttle_s 0
created_at 2026-04-08T04:18:54.848161+00:00
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