Delete row sig_9c924aa63116 from signals

id sig_9c924aa63116
event_id evt_b5b2089f3204
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_42b69816a ...
dedupe_key signal_enriched:news_delta:ca455fd715071291
throttle_s 0
created_at 2026-04-20T07:43:03.127557+00:00
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