Delete row sig_7dd6a1a696cd from signals

id sig_7dd6a1a696cd
event_id evt_8a3da7fda7ed
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_256e84a2a ...
dedupe_key signal_enriched:news_delta:77b7d568cc345124
throttle_s 0
created_at 2026-04-19T18:00:50.123990+00:00
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