Delete row sig_a544682a6e68 from signals

id sig_a544682a6e68
event_id evt_4ca730e8a336
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_a3209f43e ...
dedupe_key signal_enriched:news_delta:3961d76a885b2c9d
throttle_s 0
created_at 2026-04-13T05:10:33.929463+00:00
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