Delete row sig_acf53a3422af from signals

id sig_acf53a3422af
event_id evt_4334b75c3db6
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_e943ce8c8 ...
dedupe_key signal_enriched:news_delta:15e942795c5b8c89
throttle_s 0
created_at 2026-04-20T23:24:22.165400+00:00
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