Delete row sig_e29793b540ef from signals

id sig_e29793b540ef
event_id evt_c519b029471f
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_41566b5e6 ...
dedupe_key signal_enriched:news_delta:d5c52f1f7605a441
throttle_s 0
created_at 2026-04-18T23:11:11.180890+00:00
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