Delete row sig_ac313d91d9e6 from signals

id sig_ac313d91d9e6
event_id evt_f745e612b95c
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_9e37363ee ...
dedupe_key signal_enriched:news_delta:0cd6bea203a13070
throttle_s 0
created_at 2026-04-14T07:48:04.897057+00:00
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