Delete row sig_cd6eece2023c from signals

id sig_cd6eece2023c
event_id evt_509d4666450f
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_3bfd8eeca ...
dedupe_key signal_enriched:news_delta:71edbbf0a7261a2f
throttle_s 0
created_at 2026-04-22T10:14:41.553944+00:00
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