Delete row sig_cf6da4154745 from signals

id sig_cf6da4154745
event_id evt_6b0185c8b734
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_8c543bbf7 ...
dedupe_key signal_enriched:news_delta:142e2113b46e1fc2
throttle_s 0
created_at 2026-04-09T09:54:21.351944+00:00
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