Delete row sig_4fed69527552 from signals

id sig_4fed69527552
event_id evt_06ccb985a71f
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_d3afcd726 ...
dedupe_key signal_enriched:news_delta:a4eaa848c59765c4
throttle_s 0
created_at 2026-04-10T18:06:52.025168+00:00
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