Delete row sig_d6b989a85b6f from signals

id sig_d6b989a85b6f
event_id evt_1a48597c1479
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_29fcc2e4a ...
dedupe_key signal_enriched:news_delta:240406a6054590e9
throttle_s 0
created_at 2026-04-17T09:00:15.509546+00:00
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