Delete row sig_71f6ba1527bb from signals

id sig_71f6ba1527bb
event_id evt_222260002fc8
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_1a001e7c8 ...
dedupe_key signal_enriched:news_delta:065fa5004d5c8248
throttle_s 0
created_at 2026-04-17T09:00:15.518498+00:00
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