Delete row sig_d5f6a75d8db3 from signals

id sig_d5f6a75d8db3
event_id evt_76a0beb02335
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_d395d4fec ...
dedupe_key signal_enriched:news_delta:20c3a0754e97a173
throttle_s 0
created_at 2026-04-22T04:11:05.592582+00:00
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