Delete row sig_791a4bf1bcc8 from signals

id sig_791a4bf1bcc8
event_id evt_06450ba689ce
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_eb4125454 ...
dedupe_key signal_enriched:news_delta:ebaf6e353cb448f0
throttle_s 0
created_at 2026-04-10T03:46:52.525050+00:00
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