Delete row sig_5ac2a9ca49a6 from signals

id sig_5ac2a9ca49a6
event_id evt_2a8bd7df7b51
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_39cc401a5 ...
dedupe_key signal_enriched:news_delta:d5e17ba060a32bf2
throttle_s 0
created_at 2026-04-22T15:19:29.589457+00:00
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