Delete row sig_9f4da3ffa487 from signals

id sig_9f4da3ffa487
event_id evt_00b6dfe66ad2
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_41342185f ...
dedupe_key signal_enriched:news_delta:1cf2920ca99cd1d2
throttle_s 0
created_at 2026-04-19T03:40:38.528704+00:00
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