Delete row sig_1e3faa1adc2c from signals

id sig_1e3faa1adc2c
event_id evt_3c7a4025bf5d
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_d8aef0650 ...
dedupe_key signal_enriched:news_delta:aff37291f48fb412
throttle_s 0
created_at 2026-04-21T04:05:37.234141+00:00
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