Delete row sig_940dfb818267 from signals

id sig_940dfb818267
event_id evt_1eb123e2235c
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_28c869d53 ...
dedupe_key signal_enriched:news_delta:d0affc8d716dc130
throttle_s 0
created_at 2026-04-08T19:34:52.470199+00:00
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