Delete row sig_63399fc295bf from signals

id sig_63399fc295bf
event_id evt_c2dd95595bf0
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_6ba2d01d4 ...
dedupe_key signal_enriched:news_delta:d5d54398d48ce7d5
throttle_s 0
created_at 2026-04-22T11:31:54.065759+00:00
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