Delete row sig_cf2b63e50791 from signals

id sig_cf2b63e50791
event_id evt_288c1d4a5c08
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_d53f68f7d ...
dedupe_key signal_enriched:news_delta:6b664a5ec991098e
throttle_s 0
created_at 2026-04-14T07:32:51.504109+00:00
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