Delete row sig_a18a4c1f8770 from signals

id sig_a18a4c1f8770
event_id evt_dafe02fbe5c2
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_b5fed1657 ...
dedupe_key signal_enriched:news_delta:026c3ae73b6781a0
throttle_s 0
created_at 2026-04-19T01:31:58.568856+00:00
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