Delete row sig_50137214047f from signals

id sig_50137214047f
event_id evt_786c25899f8f
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_a53ff2847 ...
dedupe_key signal_enriched:news_delta:5b1d654ae848e67f
throttle_s 0
created_at 2026-04-16T11:41:26.492030+00:00
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