Delete row sig_789ed19f0715 from signals

id sig_789ed19f0715
event_id evt_ee6c3d1848f3
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_55e2427ef ...
dedupe_key signal_enriched:news_delta:1cd061b0ab611e81
throttle_s 0
created_at 2026-04-06T15:00:06.829504+00:00
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