Delete row sig_4486bb77cc42 from signals

id sig_4486bb77cc42
event_id evt_926e685bc77d
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_4408f80a8 ...
dedupe_key signal_enriched:news_delta:f19bb98f12e167ae
throttle_s 0
created_at 2026-04-21T02:24:00.052676+00:00
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