Delete row sig_a26428c1a2f7 from signals

id sig_a26428c1a2f7
event_id evt_ad46ef460c1c
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_83d8da13e ...
dedupe_key signal_enriched:news_delta:dc78734128310b2e
throttle_s 0
created_at 2026-04-18T18:03:45.256355+00:00
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