Delete row sig_89fae3f53697 from signals

id sig_89fae3f53697
event_id evt_5aa8a5b5f2e4
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_662a481af ...
dedupe_key signal_enriched:news_delta:99cb4ea805f703fc
throttle_s 0
created_at 2026-04-13T13:18:39.839599+00:00
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