Delete row sig_89762ab308c9 from signals

id sig_89762ab308c9
event_id evt_ebe4ff3a7a98
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_aa4420419 ...
dedupe_key signal_enriched:news_delta:ccbb2bae3ec213f5
throttle_s 0
created_at 2026-04-14T02:27:43.466812+00:00
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