Delete row sig_dc82d426c207 from signals

id sig_dc82d426c207
event_id evt_9deccaa12401
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_cee7406ac ...
dedupe_key signal_enriched:news_delta:d89e1fb376954868
throttle_s 0
created_at 2026-04-17T03:36:52.838226+00:00
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