Delete row sig_ddb74f047f60 from signals

id sig_ddb74f047f60
event_id evt_b44ace60cc31
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_80ffd88aa ...
dedupe_key signal_enriched:news_delta:b7c604072cd9809e
throttle_s 0
created_at 2026-04-06T23:19:11.762442+00:00
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