Delete row sig_444e9f30d143 from signals

id sig_444e9f30d143
event_id evt_ccb7a16ed223
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_1ec31151f ...
dedupe_key signal_enriched:news_delta:836f2d89b7e03c41
throttle_s 0
created_at 2026-04-20T14:20:31.026870+00:00
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