Delete row sig_57808775af6f from signals

id sig_57808775af6f
event_id evt_f37e34177ce9
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_5ed557481 ...
dedupe_key signal_enriched:news_delta:a242d32f26819a23
throttle_s 0
created_at 2026-04-20T02:03:27.476603+00:00
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