Delete row sig_9d4a73995f1a from signals

id sig_9d4a73995f1a
event_id evt_e045e69d7b7d
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_394cca2d7 ...
dedupe_key signal_enriched:news_delta:d4c9566518171267
throttle_s 0
created_at 2026-04-10T18:06:52.309947+00:00
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