Delete row sig_1cd4474ca764 from signals

id sig_1cd4474ca764
event_id evt_239627f288f0
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_ec421b6ff ...
dedupe_key signal_enriched:news_delta:70bfb72a87fcc2ec
throttle_s 0
created_at 2026-04-19T04:31:33.313919+00:00
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