Delete row sig_f7677d8853e2 from signals

id sig_f7677d8853e2
event_id evt_a45b95758c80
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_1d0c86506 ...
dedupe_key signal_enriched:news_delta:76b841fda1ed4dd9
throttle_s 0
created_at 2026-04-08T07:21:41.251119+00:00
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