Delete row sig_18290e249efd from signals

id sig_18290e249efd
event_id evt_bbf5d1016b2c
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_2376b48f8 ...
dedupe_key signal_enriched:news_delta:10e8c5c7536da1bf
throttle_s 0
created_at 2026-04-08T10:39:13.861007+00:00
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