Delete row sig_0567f92a0990 from signals

id sig_0567f92a0990
event_id evt_c571f8ddd14e
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_711392076 ...
dedupe_key signal_enriched:news_delta:19e27ff9f2c5f3b2
throttle_s 0
created_at 2026-04-20T21:37:11.338242+00:00
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