Delete row sig_527f19e317bc from signals

id sig_527f19e317bc
event_id evt_e3b01b6b8c4f
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_3ee0ce852 ...
dedupe_key signal_enriched:news_delta:ce69310cb69867f6
throttle_s 0
created_at 2026-04-08T06:36:01.363864+00:00
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