Delete row sig_9d5affcbbe89 from signals

id sig_9d5affcbbe89
event_id evt_90fc01c02fa0
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_c6e32dc8b ...
dedupe_key signal_enriched:news_delta:78024e312f06fe98
throttle_s 0
created_at 2026-04-20T02:34:40.281853+00:00
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