Delete row sig_b563dd76c96b from signals

id sig_b563dd76c96b
event_id evt_4040616c60f9
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_01072e56a ...
dedupe_key signal_enriched:news_delta:f189caa7d62b484b
throttle_s 0
created_at 2026-04-05T01:23:26.796388+00:00
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