Delete row sig_4832952777a3 from signals

id sig_4832952777a3
event_id evt_90a5c447a825
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_6f922d285 ...
dedupe_key signal_enriched:news_delta:e6d1cc66ca256e5b
throttle_s 0
created_at 2026-04-22T04:11:05.581943+00:00
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