Delete row sig_d669d318fe8a from signals

id sig_d669d318fe8a
event_id evt_877bf2c298aa
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_45bf72566 ...
dedupe_key signal_enriched:news_delta:ee52949f7344d10b
throttle_s 0
created_at 2026-04-19T19:30:21.205738+00:00
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