Delete row sig_ae309b655589 from signals

id sig_ae309b655589
event_id evt_5c3a7e353cc3
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_d1bd6ab8a ...
dedupe_key signal_enriched:news_delta:56945a77e665c549
throttle_s 0
created_at 2026-04-09T12:01:20.918169+00:00
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