Delete row sig_08f2a1555276 from signals

id sig_08f2a1555276
event_id evt_3f12f2360034
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_bb57f2209 ...
dedupe_key signal_enriched:news_delta:b3523b6d8a3529db
throttle_s 0
created_at 2026-04-19T00:41:27.300738+00:00
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