Delete row sig_5789b610832f from signals

id sig_5789b610832f
event_id evt_49bcad6a6b6a
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_6de472f48 ...
dedupe_key signal_enriched:news_delta:070c20256fd16164
throttle_s 0
created_at 2026-04-17T09:00:15.613754+00:00
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