Delete row sig_a43bb28bcb1f from signals

id sig_a43bb28bcb1f
event_id evt_fae98627b5e1
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_70d734bfb ...
dedupe_key signal_enriched:news_delta:13025a8bab9fc054
throttle_s 0
created_at 2026-04-21T16:42:29.753106+00:00
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