Delete row sig_3938142c9c5b from signals

id sig_3938142c9c5b
event_id evt_1506e110543f
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_1d95bdf7e ...
dedupe_key signal_enriched:news_delta:1e5f955571fe90ee
throttle_s 0
created_at 2026-04-21T04:44:49.720505+00:00
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