Delete row sig_9509c165047b from signals

id sig_9509c165047b
event_id evt_d1eee6b3d5f0
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_846ddd008 ...
dedupe_key signal_enriched:news_delta:da4877f01a07ed49
throttle_s 0
created_at 2026-04-09T22:16:09.138971+00:00
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