Delete row sig_129947e40e2f from signals

id sig_129947e40e2f
event_id evt_8a17d9c63450
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_9d1271e7a ...
dedupe_key signal_enriched:news_delta:9fd1c9d5a1ff3198
throttle_s 0
created_at 2026-04-20T11:15:52.436042+00:00
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