Delete row sig_f45f26640479 from signals

id sig_f45f26640479
event_id evt_9433583d3396
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_896bc34f6 ...
dedupe_key signal_enriched:news_delta:dbd272258a43b9b6
throttle_s 0
created_at 2026-04-16T14:00:58.240672+00:00
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