Delete row sig_506399b4c690 from signals

id sig_506399b4c690
event_id evt_3e56f199ca80
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_b7b86cf17 ...
dedupe_key signal_enriched:news_delta:a66e1198eb2686e6
throttle_s 0
created_at 2026-04-17T20:17:18.707164+00:00
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