Delete row sig_46e8dbe9838a from signals

id sig_46e8dbe9838a
event_id evt_3b3703511888
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_9909a0daf ...
dedupe_key signal_enriched:news_delta:2ae2b5abd20b39c7
throttle_s 0
created_at 2026-04-10T19:36:11.877695+00:00
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