Delete row sig_9933c3d2433f from signals

id sig_9933c3d2433f
event_id evt_ea8bb816145f
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_353f67918 ...
dedupe_key signal_enriched:news_delta:4b447a213f49ce01
throttle_s 0
created_at 2026-04-21T00:52:49.661058+00:00
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