Delete row sig_20170e6f4728 from signals

id sig_20170e6f4728
event_id evt_31d0506d6d77
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_fb94287be ...
dedupe_key signal_enriched:news_delta:9dfd5e367a00b17b
throttle_s 0
created_at 2026-04-19T08:08:54.930149+00:00
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