Delete row sig_9533d5b1a2c2 from signals

id sig_9533d5b1a2c2
event_id evt_755aad6d9b57
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_0ddfc9ab9 ...
dedupe_key signal_enriched:news_delta:74c5ae404c892730
throttle_s 0
created_at 2026-04-17T21:07:05.582932+00:00
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