Delete row sig_99b924e77dd3 from signals

id sig_99b924e77dd3
event_id evt_177c449cef7b
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_26fc2086f ...
dedupe_key signal_enriched:news_delta:f9f40bc3c1d5e1f1
throttle_s 0
created_at 2026-04-20T05:07:23.253577+00:00
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