Delete row sig_d2cc98643d05 from signals

id sig_d2cc98643d05
event_id evt_8aaa075b131a
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_0360e083b ...
dedupe_key signal_enriched:news_delta:4ff09dff16078384
throttle_s 0
created_at 2026-04-12T22:11:41.818345+00:00
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