Delete row sig_efd6d396b21d from signals

id sig_efd6d396b21d
event_id evt_a922882db4e9
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_f32909ebb ...
dedupe_key signal_enriched:news_delta:97d2f1f28407330b
throttle_s 0
created_at 2026-04-20T18:43:38.179610+00:00
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