Delete row sig_424fa0716d6f from signals

id sig_424fa0716d6f
event_id evt_ef71c05400d3
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_4ac4f623e ...
dedupe_key signal_enriched:news_delta:4c798a05d63f6fe6
throttle_s 0
created_at 2026-04-19T22:46:35.615665+00:00
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