Delete row sig_99f302a76125 from signals

id sig_99f302a76125
event_id evt_f66901cd0e3b
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_b65e74087 ...
dedupe_key signal_enriched:news_delta:01f91971ee356148
throttle_s 0
created_at 2026-04-07T05:08:56.731674+00:00
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