Delete row sig_3ead9828273b from signals

id sig_3ead9828273b
event_id evt_59e6d4ff0e2f
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_d58ce3942 ...
dedupe_key signal_enriched:news_delta:eeda4222cac71b70
throttle_s 0
created_at 2026-04-11T14:22:56.076569+00:00
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