Delete row sig_4c05d86e1374 from signals

id sig_4c05d86e1374
event_id evt_f883ae0c7477
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_6fc1d04be ...
dedupe_key signal_enriched:news_delta:d1c383b5af3b924c
throttle_s 0
created_at 2026-04-18T16:34:29.916045+00:00
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