Delete row sig_76b96c0332aa from signals

id sig_76b96c0332aa
event_id evt_b407f8f06841
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_1542e1edc ...
dedupe_key signal_enriched:news_delta:0917d0f943f5618f
throttle_s 0
created_at 2026-04-06T17:07:34.287858+00:00
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