Delete row sig_9f2b91bcf05f from signals

id sig_9f2b91bcf05f
event_id evt_937077bdd708
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_e0269e151 ...
dedupe_key signal_enriched:news_delta:91ce94f1e7cc3b08
throttle_s 0
created_at 2026-04-06T17:07:35.431946+00:00
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