Delete row sig_a6ac97be9ba1 from signals

id sig_a6ac97be9ba1
event_id evt_f80fc73036ad
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_a980d99b7 ...
dedupe_key signal_enriched:news_delta:a47459fed6292dee
throttle_s 0
created_at 2026-04-13T13:18:39.830081+00:00
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