Delete row sig_f6cf48e8a714 from signals

id sig_f6cf48e8a714
event_id evt_5d40355818cd
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_087eae5e2 ...
dedupe_key signal_enriched:news_delta:62e2132bc3786078
throttle_s 0
created_at 2026-04-20T08:43:35.756600+00:00
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