Delete row sig_8af8b627430c from signals

id sig_8af8b627430c
event_id evt_466ae15f1a33
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_19197a5bd ...
dedupe_key signal_enriched:news_delta:d03d1da89f5cf6d2
throttle_s 0
created_at 2026-04-16T09:25:11.114154+00:00
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