Delete row sig_99697bc46c82 from signals

id sig_99697bc46c82
event_id evt_2bb3e14e6646
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_6753520d9 ...
dedupe_key signal_enriched:news_delta:3387f80c4ab9c765
throttle_s 0
created_at 2026-04-19T19:30:21.522235+00:00
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