Delete row sig_dc44f0428272 from signals

id sig_dc44f0428272
event_id evt_8570f776b5ad
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_bbbd1cdb6 ...
dedupe_key signal_enriched:news_delta:afcd15963d98bb99
throttle_s 0
created_at 2026-04-10T10:05:26.186042+00:00
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