Delete row sig_4591e7977632 from signals

id sig_4591e7977632
event_id evt_25c70aa3ec72
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_2e653f876 ...
dedupe_key signal_enriched:news_delta:1c45072dd7383880
throttle_s 0
created_at 2026-04-21T07:00:36.864401+00:00
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