Delete row sig_38246942e6f9 from signals

id sig_38246942e6f9
event_id evt_4af0a3acfacb
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_e59f15c72 ...
dedupe_key signal_enriched:news_delta:869a4fdd4577435f
throttle_s 0
created_at 2026-04-06T20:42:08.491719+00:00
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