Delete row sig_c8c4503abf9f from signals

id sig_c8c4503abf9f
event_id evt_db599408e303
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_5075121d3 ...
dedupe_key signal_enriched:news_delta:04850ef4d84cfc99
throttle_s 0
created_at 2026-04-09T22:00:40.528463+00:00
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