Delete row sig_931ecac1f935 from signals

id sig_931ecac1f935
event_id evt_1ccfdccb54fa
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_a4fe76d8b ...
dedupe_key signal_enriched:news_delta:05b4111977568e22
throttle_s 0
created_at 2026-04-19T13:31:32.481198+00:00
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