Delete row sig_9fc04312febd from signals

id sig_9fc04312febd
event_id evt_4b1845b88796
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_30d080333 ...
dedupe_key signal_enriched:news_delta:8bb5e20d954738d1
throttle_s 0
created_at 2026-04-08T23:28:56.509209+00:00
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