Delete row sig_83ff2afc2874 from signals

id sig_83ff2afc2874
event_id evt_6461d517a61b
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_fc905ccb1 ...
dedupe_key signal_enriched:news_delta:267fa3c433e14ac0
throttle_s 0
created_at 2026-04-22T15:19:29.564924+00:00
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