Delete row sig_498bd7f63b56 from signals

id sig_498bd7f63b56
event_id evt_40bd4158f033
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_0ccc5c0ca ...
dedupe_key signal_enriched:news_delta:22275625348703ba
throttle_s 0
created_at 2026-04-20T05:23:11.412833+00:00
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