Delete row sig_9a544476bd83 from signals

id sig_9a544476bd83
event_id evt_ff4b7abd51e9
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_821fac755 ...
dedupe_key signal_enriched:news_delta:0508eae83428fe71
throttle_s 0
created_at 2026-04-11T10:31:21.227011+00:00
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