Delete row sig_9c560c10d241 from signals

id sig_9c560c10d241
event_id evt_a3e23b117261
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_645f64644 ...
dedupe_key signal_enriched:news_delta:3534eb549423e9e7
throttle_s 0
created_at 2026-04-10T13:23:10.924568+00:00
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