Delete row sig_e8ca6d61e103 from signals

id sig_e8ca6d61e103
event_id evt_d034da623d8b
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_518a3aa63 ...
dedupe_key signal_enriched:news_delta:91c8983ce07a8cb2
throttle_s 0
created_at 2026-04-09T15:01:34.063587+00:00
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