Delete row sig_3dd42049e4af from signals

id sig_3dd42049e4af
event_id evt_5a26f8bd9530
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_54bcb37f7 ...
dedupe_key signal_enriched:news_delta:5994d8dd186da191
throttle_s 0
created_at 2026-04-20T02:34:40.494387+00:00
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