Delete row sig_6cf2aa4a333b from signals

id sig_6cf2aa4a333b
event_id evt_81d6f3ea71fd
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_230bc66f0 ...
dedupe_key signal_enriched:news_delta:5645606939d96b8d
throttle_s 0
created_at 2026-04-20T21:37:11.307684+00:00
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