Delete row sig_a1cf71f2a0b9 from signals

id sig_a1cf71f2a0b9
event_id evt_b93ee64ab201
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_97ad2b2e2 ...
dedupe_key signal_enriched:news_delta:97e00f61ae4fbaf3
throttle_s 0
created_at 2026-04-19T07:31:03.542886+00:00
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