Delete row sig_2ce96212f4cd from signals

id sig_2ce96212f4cd
event_id evt_1521f73c9bb1
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_5a4734ceb ...
dedupe_key signal_enriched:news_delta:0b3d4a2888abacfe
throttle_s 0
created_at 2026-04-10T14:15:35.032787+00:00
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