Delete row sig_29154a67231d from signals

id sig_29154a67231d
event_id evt_ded154a5ffad
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_75e227c72 ...
dedupe_key signal_enriched:news_delta:e26d3ff7bafc5322
throttle_s 0
created_at 2026-04-08T12:09:43.399477+00:00
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