Delete row sig_2d9ba01b4699 from signals

id sig_2d9ba01b4699
event_id evt_92403cf85389
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_37c099d89 ...
dedupe_key signal_enriched:news_delta:e0e9cb8044c8489b
throttle_s 0
created_at 2026-04-19T20:59:44.817041+00:00
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