Delete row sig_af8de4500291 from signals

id sig_af8de4500291
event_id evt_1fc08024fbdb
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_ae1684cc9 ...
dedupe_key signal_enriched:news_delta:0bfc15b9892813fc
throttle_s 0
created_at 2026-04-10T02:44:17.227279+00:00
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