Delete row sig_a70ec74bf476 from signals

id sig_a70ec74bf476
event_id evt_a1942529aa3d
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_fecb04d74 ...
dedupe_key signal_enriched:news_delta:5425364836a80fba
throttle_s 0
created_at 2026-04-10T08:19:32.172294+00:00
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