Delete row sig_608fa88e16e8 from signals

id sig_608fa88e16e8
event_id evt_a6a78013858f
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_41c3ecb22 ...
dedupe_key signal_enriched:news_delta:9ccdef0a52dfb80b
throttle_s 0
created_at 2026-04-07T05:08:56.751483+00:00
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