Delete row sig_570c6faff224 from signals

id sig_570c6faff224
event_id evt_9ee723d60fcc
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_43fdf1e1d ...
dedupe_key signal_enriched:news_delta:0a0e38d991a043ec
throttle_s 0
created_at 2026-04-20T12:01:18.763439+00:00
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