Delete row sig_917e6bfa690e from signals

id sig_917e6bfa690e
event_id evt_4578ad8a22fc
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_8ab92a5e2 ...
dedupe_key signal_enriched:news_delta:23770b97cbff8c0c
throttle_s 0
created_at 2026-04-09T22:47:28.535774+00:00
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