Delete row sig_d1e99676762f from signals

id sig_d1e99676762f
event_id evt_331866c55053
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_6fce5394e ...
dedupe_key signal_enriched:news_delta:96c00dc542d1db2f
throttle_s 0
created_at 2026-04-08T05:04:20.144497+00:00
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