Delete row sig_3c9e2a09810c from signals

id sig_3c9e2a09810c
event_id evt_ccb0f5bd6f3d
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_bd1a630b2 ...
dedupe_key signal_enriched:news_delta:9623a7b5ca26317d
throttle_s 0
created_at 2026-04-22T11:16:45.416026+00:00
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