Delete row sig_f6589a062747 from signals

id sig_f6589a062747
event_id evt_62eb9c6d227e
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_15aedae45 ...
dedupe_key signal_enriched:news_delta:36fda715694d3c2b
throttle_s 0
created_at 2026-04-12T08:05:33.734205+00:00
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