Delete row sig_9996bdf4c6eb from signals

id sig_9996bdf4c6eb
event_id evt_a56d530ffeee
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_c7c56efb9 ...
dedupe_key signal_enriched:news_delta:da3c89935ec49d09
throttle_s 0
created_at 2026-04-08T06:36:01.114709+00:00
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