Delete row sig_ab899cdbb981 from signals

id sig_ab899cdbb981
event_id evt_5fa590120eb0
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_5c86c2c7b ...
dedupe_key signal_enriched:news_delta:58cddbe4378a6763
throttle_s 0
created_at 2026-04-08T19:34:52.451187+00:00
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