Delete row sig_9e8d0a80368b from signals

id sig_9e8d0a80368b
event_id evt_5f104f4a8c8b
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_8887009c2 ...
dedupe_key signal_enriched:news_delta:da8a03d03d844390
throttle_s 0
created_at 2026-04-19T06:01:07.918430+00:00
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