Delete row sig_6a775308e8f1 from signals

id sig_6a775308e8f1
event_id evt_dcd885f57feb
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_899b28bbb ...
dedupe_key signal_enriched:news_delta:94bb9b1737ea8946
throttle_s 0
created_at 2026-04-09T11:22:55.220073+00:00
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