Delete row sig_29ab1b60d494 from signals

id sig_29ab1b60d494
event_id evt_f7a874ded3a9
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_92d8b92c5 ...
dedupe_key signal_enriched:news_delta:7bf7fa117e2a31e4
throttle_s 0
created_at 2026-04-11T12:02:41.788392+00:00
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