Delete row sig_ac6d21a452ee from signals

id sig_ac6d21a452ee
event_id evt_61bda58b0c48
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_f1461da30 ...
dedupe_key signal_enriched:news_delta:a7169477f6209128
throttle_s 0
created_at 2026-04-20T22:09:16.557188+00:00
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