Delete row sig_56ccb78a2784 from signals

id sig_56ccb78a2784
event_id evt_0a3e2edee739
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_880843c81 ...
dedupe_key signal_enriched:news_delta:6bf0764ff91aea7b
throttle_s 0
created_at 2026-04-12T12:08:56.625124+00:00
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