Delete row sig_9594177cf36a from signals

id sig_9594177cf36a
event_id evt_e3f33fe956c3
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_0ecf92ea2 ...
dedupe_key signal_enriched:news_delta:36c3ad67ed785459
throttle_s 0
created_at 2026-04-13T13:18:39.869325+00:00
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