Delete row sig_93d539647229 from signals

id sig_93d539647229
event_id evt_3756868532bb
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_82bffd91f ...
dedupe_key signal_enriched:news_delta:5991de6bfdfdb113
throttle_s 0
created_at 2026-04-08T22:21:15.507341+00:00
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