Delete row sig_6a6fe355ac2c from signals

id sig_6a6fe355ac2c
event_id evt_89cd12cd3270
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_63b3e70f8 ...
dedupe_key signal_enriched:news_delta:d87795399e7d1656
throttle_s 0
created_at 2026-04-20T10:45:39.407556+00:00
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