Delete row sig_a63634503691 from signals

id sig_a63634503691
event_id evt_efd169ef9772
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_681a5bc99 ...
dedupe_key signal_enriched:news_delta:a2faef0673d486bb
throttle_s 0
created_at 2026-04-17T09:39:35.325784+00:00
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