Delete row sig_86015ab95246 from signals

id sig_86015ab95246
event_id evt_1ce2dd0d3760
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_3ae1c68e2 ...
dedupe_key signal_enriched:news_delta:cb34c895c5b9279f
throttle_s 0
created_at 2026-04-07T23:39:52.388923+00:00
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