Delete row sig_efa6a2b49fcb from signals

id sig_efa6a2b49fcb
event_id evt_b91ef720bd09
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_0ef31ab3a ...
dedupe_key signal_enriched:news_delta:12f96ca3084deb5b
throttle_s 0
created_at 2026-04-07T05:08:56.356883+00:00
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