Delete row sig_2634f16d1c56 from signals

id sig_2634f16d1c56
event_id evt_fdb86caff565
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_5914de6a2 ...
dedupe_key signal_enriched:news_delta:d5f661e687e28daa
throttle_s 0
created_at 2026-04-08T06:36:01.585201+00:00
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