Delete row sig_a6fb930b0def from signals

id sig_a6fb930b0def
event_id evt_58dd120e2e53
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_81a0c78e5 ...
dedupe_key signal_enriched:news_delta:91f894b190f6de22
throttle_s 0
created_at 2026-04-20T09:28:58.762622+00:00
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