Delete row sig_e586bc6cc271 from signals

id sig_e586bc6cc271
event_id evt_a389324246d5
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_bf57f4ca4 ...
dedupe_key signal_enriched:news_delta:a6b5f3276bfa50da
throttle_s 0
created_at 2026-04-13T19:00:27.313813+00:00
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