Delete row sig_a1d5b2f65678 from signals

id sig_a1d5b2f65678
event_id evt_01317592948a
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_11ff40c9c ...
dedupe_key signal_enriched:news_delta:8a797789f53dac8b
throttle_s 0
created_at 2026-04-20T23:24:21.927662+00:00
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