Delete row sig_6484002c76bc from signals

id sig_6484002c76bc
event_id evt_f88e18169000
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_227744800 ...
dedupe_key signal_enriched:news_delta:cc84dbd17c87f73f
throttle_s 0
created_at 2026-04-10T16:36:01.312573+00:00
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