Delete row sig_df9a2186daa9 from signals

id sig_df9a2186daa9
event_id evt_d0295c0b9697
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_69ccb466a ...
dedupe_key signal_enriched:news_delta:d258bcd6e94b2a7f
throttle_s 0
created_at 2026-04-22T11:31:53.968685+00:00
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