Delete row sig_791f2252ecc8 from signals

id sig_791f2252ecc8
event_id evt_bc752406c1ae
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_897dc42f6 ...
dedupe_key signal_enriched:news_delta:2fb2abce6595c671
throttle_s 0
created_at 2026-04-20T00:02:15.386599+00:00
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