Delete row sig_ad5129bf2a19 from signals

id sig_ad5129bf2a19
event_id evt_8f82c8ba3817
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_345b09e1d ...
dedupe_key signal_enriched:news_delta:1cc7cbf8e2e6874a
throttle_s 0
created_at 2026-04-07T00:26:15.478918+00:00
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