Delete row sig_3a253e6b2490 from signals

id sig_3a253e6b2490
event_id evt_f157bfe0057a
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_3610e5ad7 ...
dedupe_key signal_enriched:news_delta:e675cd4ab8e189d4
throttle_s 0
created_at 2026-04-21T00:02:03.881776+00:00
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