Delete row sig_90d95517b9f1 from signals

id sig_90d95517b9f1
event_id evt_842387e1216a
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_54f02f883 ...
dedupe_key signal_enriched:news_delta:5019186b736617f3
throttle_s 0
created_at 2026-04-20T07:43:03.487738+00:00
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