Delete row sig_71decff905d4 from signals

id sig_71decff905d4
event_id evt_f197961a6dc3
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_ecc0701f1 ...
dedupe_key signal_enriched:news_delta:8660a112ac974a8f
throttle_s 0
created_at 2026-04-22T04:26:15.589056+00:00
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