Delete row sig_f637f3fb647a from signals

id sig_f637f3fb647a
event_id evt_f7530540d59b
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_eb7b048ec ...
dedupe_key signal_enriched:news_delta:59ebcc7b433acced
throttle_s 0
created_at 2026-04-18T11:03:21.329527+00:00
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