Delete row sig_f76876e10fbf from signals

id sig_f76876e10fbf
event_id evt_784fb8939071
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_8ce97f9e4 ...
dedupe_key signal_enriched:news_delta:6b61935ff6f3fa17
throttle_s 0
created_at 2026-04-21T09:09:35.555113+00:00
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