Delete row sig_956fbc2a9dd3 from signals

id sig_956fbc2a9dd3
event_id evt_b1e4741d99ec
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_6b954cab6 ...
dedupe_key signal_enriched:news_delta:ce1dddcd6495b983
throttle_s 0
created_at 2026-04-12T18:31:27.584659+00:00
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