Delete row sig_4aa92963d3cc from signals

id sig_4aa92963d3cc
event_id evt_df5ca1c74245
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_bdc8a8f6c ...
dedupe_key signal_enriched:news_delta:bcde404fd7257cdd
throttle_s 0
created_at 2026-04-08T12:09:43.328630+00:00
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