Delete row sig_0256de12df99 from signals

id sig_0256de12df99
event_id evt_d0d76d0c68ba
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_34c4c9be3 ...
dedupe_key signal_enriched:news_delta:0f20c3d2456344c6
throttle_s 0
created_at 2026-04-21T16:42:29.659028+00:00
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