Delete row sig_2d5f9957e740 from signals

id sig_2d5f9957e740
event_id evt_68450b16ce3f
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_9b1fcda76 ...
dedupe_key signal_enriched:news_delta:a635125002e0828a
throttle_s 0
created_at 2026-04-10T19:36:11.788802+00:00
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