Delete row sig_de8bad8b7af9 from signals

id sig_de8bad8b7af9
event_id evt_d3dea6384702
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_d2e046d13 ...
dedupe_key signal_enriched:news_delta:c26f258bb5cb881d
throttle_s 0
created_at 2026-04-08T01:58:44.240506+00:00
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