Delete row sig_46688b853962 from signals

id sig_46688b853962
event_id evt_ca27976df64f
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_271073f67 ...
dedupe_key signal_enriched:news_delta:0fc626544df92b49
throttle_s 0
created_at 2026-04-13T11:10:14.271799+00:00
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