Delete row sig_2298b9fa328d from signals

id sig_2298b9fa328d
event_id evt_029e6795ce08
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_45c3adb6f ...
dedupe_key signal_enriched:news_delta:969b3f2a99284398
throttle_s 0
created_at 2026-04-09T08:24:01.206535+00:00
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