Delete row sig_6c76f28be151 from signals

id sig_6c76f28be151
event_id evt_2e38b90933a7
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_654a616d0 ...
dedupe_key signal_enriched:news_delta:8f68341d40ae6111
throttle_s 0
created_at 2026-04-09T15:01:32.922528+00:00
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