Delete row sig_e8489d52143a from signals

id sig_e8489d52143a
event_id evt_03711e154790
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_340e54c6c ...
dedupe_key signal_enriched:news_delta:57f6a934e97226ab
throttle_s 0
created_at 2026-04-18T22:33:11.850420+00:00
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