Delete row sig_2a8a844bbd1a from signals

id sig_2a8a844bbd1a
event_id evt_4f07e3a50e3a
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_9757e64d8 ...
dedupe_key signal_enriched:news_delta:f99d32c0f269990c
throttle_s 0
created_at 2026-04-17T19:38:48.545768+00:00
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