Delete row sig_0567f8bd681d from signals

id sig_0567f8bd681d
event_id evt_77fcb498c1bf
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_78d934d02 ...
dedupe_key signal_enriched:news_delta:b0c0628115aad6ac
throttle_s 0
created_at 2026-04-22T12:17:14.459247+00:00
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