Delete row sig_dcf365772825 from signals

id sig_dcf365772825
event_id evt_fdb0c59eeb0f
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_e49cc9f6b ...
dedupe_key signal_enriched:news_delta:e96ff67447b4266a
throttle_s 0
created_at 2026-04-08T08:52:34.382774+00:00
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