Delete row sig_0839faee625f from signals

id sig_0839faee625f
event_id evt_c00f4fc49730
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_6cbdc9c27 ...
dedupe_key signal_enriched:news_delta:b52defec897c3001
throttle_s 0
created_at 2026-04-06T21:50:13.233996+00:00
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