Delete row sig_99e824561916 from signals

id sig_99e824561916
event_id evt_6066e613db0f
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_16a08d31f ...
dedupe_key signal_enriched:news_delta:46375d7c3f0f33a1
throttle_s 0
created_at 2026-04-09T01:37:46.871329+00:00
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