Delete row sig_530e76cf33b5 from signals

id sig_530e76cf33b5
event_id evt_f472f0314994
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_24c0b8c1e ...
dedupe_key signal_enriched:news_delta:8e74e44e38f1de23
throttle_s 0
created_at 2026-04-19T03:40:38.491726+00:00
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