Delete row sig_6a989b531e7f from signals

id sig_6a989b531e7f
event_id evt_d1ceead3cda1
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_0e1959ed2 ...
dedupe_key signal_enriched:news_delta:32f7b413a9417b7c
throttle_s 0
created_at 2026-04-17T19:38:47.990637+00:00
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