Delete row sig_1429f779dde3 from signals

id sig_1429f779dde3
event_id evt_0fcbf8d4aa64
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_24f492827 ...
dedupe_key signal_enriched:news_delta:08146d929cf3b392
throttle_s 0
created_at 2026-04-21T00:52:49.494411+00:00
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