Delete row sig_d169dd4f779f from signals

id sig_d169dd4f779f
event_id evt_945796d69eed
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_6ed351e3f ...
dedupe_key signal_enriched:news_delta:c1d5f89f2c6f7e84
throttle_s 0
created_at 2026-04-09T19:28:45.814994+00:00
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