Delete row sig_29128b4444fe from signals

id sig_29128b4444fe
event_id evt_c7a485f9059e
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_0f77273f7 ...
dedupe_key signal_enriched:news_delta:018c6b8db2e02c89
throttle_s 0
created_at 2026-04-10T15:03:23.392720+00:00
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