Delete row sig_a79a7b67a79b from signals

id sig_a79a7b67a79b
event_id evt_7deb19b81ced
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_f19f6c333 ...
dedupe_key signal_enriched:news_delta:1170e8d002b43ee0
throttle_s 0
created_at 2026-04-20T13:18:59.695811+00:00
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