Delete row sig_9d2523186d76 from signals

id sig_9d2523186d76
event_id evt_9704c22f035c
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_a8a35af1c ...
dedupe_key signal_enriched:news_delta:b1dbb0c68a2a8e5d
throttle_s 0
created_at 2026-04-20T11:31:01.327835+00:00
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