Delete row sig_980984466cb7 from signals

id sig_980984466cb7
event_id evt_3e3bd8b7f556
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_1db20501a ...
dedupe_key signal_enriched:news_delta:f1c8ec7b89a6b6c0
throttle_s 0
created_at 2026-04-19T12:39:39.706691+00:00
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