Delete row sig_76d48f8b511b from signals

id sig_76d48f8b511b
event_id evt_fd67fa83f184
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_d0f082fd7 ...
dedupe_key signal_enriched:news_delta:015bb89168c9645c
throttle_s 0
created_at 2026-04-18T16:34:30.576965+00:00
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