Delete row sig_76a9acb82828 from signals

id sig_76a9acb82828
event_id evt_45c72087add8
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_3813d2d48 ...
dedupe_key signal_enriched:news_delta:fe3017101d101f8e
throttle_s 0
created_at 2026-04-11T00:55:46.065718+00:00
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