Delete row sig_6a4ed16b6188 from signals

id sig_6a4ed16b6188
event_id evt_8b8be5b9b38c
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_a9e05e3f3 ...
dedupe_key signal_enriched:news_delta:c79e21c4fa65d84b
throttle_s 0
created_at 2026-04-18T15:11:39.843578+00:00
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