Delete row sig_b97ec9e877f6 from signals

id sig_b97ec9e877f6
event_id evt_4296efff1b7f
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_9eaddfe53 ...
dedupe_key signal_enriched:news_delta:977b22ac05f3f293
throttle_s 0
created_at 2026-04-21T09:09:35.817772+00:00
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