Delete row sig_1af3379012c6 from signals

id sig_1af3379012c6
event_id evt_c540544d2873
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_d784b17c7 ...
dedupe_key signal_enriched:news_delta:922461a113209c23
throttle_s 0
created_at 2026-04-07T06:53:57.562012+00:00
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