Delete row sig_ca6822595586 from signals

id sig_ca6822595586
event_id evt_7cc86a9111e9
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_77d9b80bc ...
dedupe_key signal_enriched:news_delta:1e9dbe78f84c35a0
throttle_s 0
created_at 2026-04-13T13:18:39.848665+00:00
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