Delete row sig_6fb245cc70c9 from signals

id sig_6fb245cc70c9
event_id evt_6975126bef98
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_fdf316e45 ...
dedupe_key signal_enriched:news_delta:d009c34ac117d3f0
throttle_s 0
created_at 2026-04-20T11:46:13.801188+00:00
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