Delete row sig_ac06277610f0 from signals

id sig_ac06277610f0
event_id evt_7551f3a6441a
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_7c9f10bd6 ...
dedupe_key signal_enriched:news_delta:74c53f4f57000165
throttle_s 0
created_at 2026-04-20T19:26:44.555350+00:00
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