Delete row sig_982ececfb7f5 from signals

id sig_982ececfb7f5
event_id evt_e591fa49104a
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_3d1d99ebe ...
dedupe_key signal_enriched:news_delta:bc6746acbb6e50d9
throttle_s 0
created_at 2026-04-07T06:53:57.547103+00:00
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