Delete row sig_63655ad8ca2d from signals

id sig_63655ad8ca2d
event_id evt_de6643a4ffa3
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_0693eff05 ...
dedupe_key signal_enriched:news_delta:9566cbafe053fc48
throttle_s 0
created_at 2026-04-20T14:50:32.476876+00:00
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