Delete row sig_a48d8e826bf6 from signals

id sig_a48d8e826bf6
event_id evt_a3fbbeafe8e8
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_64795a650 ...
dedupe_key signal_enriched:news_delta:126cc5fa00c1c0cf
throttle_s 0
created_at 2026-04-10T16:36:01.307525+00:00
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