Delete row sig_99694cfe6d96 from signals

id sig_99694cfe6d96
event_id evt_402f55d6fbab
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_9d493602e ...
dedupe_key signal_enriched:news_delta:12d7a9fad2d3ab88
throttle_s 0
created_at 2026-04-22T13:02:42.859099+00:00
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