Delete row sig_1e85c5f8cbb1 from signals

id sig_1e85c5f8cbb1
event_id evt_91e7c720ef36
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_c53545c33 ...
dedupe_key signal_enriched:news_delta:37eaf81cd4b951be
throttle_s 0
created_at 2026-04-21T04:05:36.906291+00:00
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