Delete row sig_9c97d68bf94e from signals

id sig_9c97d68bf94e
event_id evt_bb999b2e0fba
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_70844d862 ...
dedupe_key signal_enriched:news_delta:0c323599c0f9440b
throttle_s 0
created_at 2026-04-20T12:01:18.009051+00:00
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