Delete row sig_a293ff18363d from signals

id sig_a293ff18363d
event_id evt_22bf854f69e6
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_3106f4028 ...
dedupe_key signal_enriched:news_delta:d9d6313faecf9fa8
throttle_s 0
created_at 2026-04-21T09:09:35.832357+00:00
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