Delete row sig_d8509696b16f from signals

id sig_d8509696b16f
event_id evt_6e480ee8834a
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_b85d1c3af ...
dedupe_key signal_enriched:news_delta:058df63fb63e274b
throttle_s 0
created_at 2026-04-20T13:49:15.174852+00:00
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