Delete row sig_4219f7e74200 from signals

id sig_4219f7e74200
event_id evt_6d2f6a059f93
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_09a94d2d2 ...
dedupe_key signal_enriched:news_delta:80d890826913956b
throttle_s 0
created_at 2026-04-08T01:28:21.068306+00:00
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