Delete row sig_4a94fe855b5f from signals

id sig_4a94fe855b5f
event_id evt_dbc44bab3df3
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_1a9de94c6 ...
dedupe_key signal_enriched:news_delta:f87a3da75f7bb6a9
throttle_s 0
created_at 2026-04-14T11:35:08.345142+00:00
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