Delete row sig_0c11409e1f75 from signals

id sig_0c11409e1f75
event_id evt_ae00404b19e6
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_5decc2d0e ...
dedupe_key signal_enriched:news_delta:830510bb64a45824
throttle_s 0
created_at 2026-04-20T03:35:20.494341+00:00
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