Delete row sig_5508c3a8ee2b from signals

id sig_5508c3a8ee2b
event_id evt_56619c9edd7c
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_0de59ab11 ...
dedupe_key signal_enriched:news_delta:03f30909d1b863fd
throttle_s 0
created_at 2026-04-20T01:17:56.144765+00:00
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