Delete row sig_02f367e1ab10 from signals

id sig_02f367e1ab10
event_id evt_a66192d9d4a4
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_d81c7de4e ...
dedupe_key signal_enriched:news_delta:882ded7baba53579
throttle_s 0
created_at 2026-04-04T23:54:34.750036+00:00
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