Delete row sig_ab5f02f3e109 from signals

id sig_ab5f02f3e109
event_id evt_71428072764b
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_c8806e7f8 ...
dedupe_key signal_enriched:news_delta:ac7e8372ed525647
throttle_s 0
created_at 2026-04-19T23:32:01.610145+00:00
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