Delete row sig_9241862e74b2 from signals

id sig_9241862e74b2
event_id evt_0d91211331cb
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_d999f39fa ...
dedupe_key signal_enriched:news_delta:324a08d3eb5e22e6
throttle_s 0
created_at 2026-04-07T02:56:08.045042+00:00
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