Delete row sig_99b679af8369 from signals

id sig_99b679af8369
event_id evt_043ed9f5aa2c
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_d44a548e1 ...
dedupe_key signal_enriched:news_delta:58c623c239354280
throttle_s 0
created_at 2026-04-19T06:39:15.456084+00:00
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