Delete row sig_56dff0cd291b from signals

id sig_56dff0cd291b
event_id evt_3f75b1b7871e
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_bb35ba20e ...
dedupe_key signal_enriched:news_delta:092e243441209e19
throttle_s 0
created_at 2026-04-12T07:19:58.151499+00:00
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