Delete row sig_5f9cf457a451 from signals

id sig_5f9cf457a451
event_id evt_6d4c28474d49
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_41ab2456c ...
dedupe_key signal_enriched:news_delta:0f177951b087f8e6
throttle_s 0
created_at 2026-04-08T08:37:24.462617+00:00
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