Delete row sig_50926872957c from signals

id sig_50926872957c
event_id evt_fff2fd87fb49
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_f569bd4eb ...
dedupe_key signal_enriched:news_delta:78ee6e5bf042cbd0
throttle_s 0
created_at 2026-04-16T11:56:33.649181+00:00
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