Delete row sig_dd7b218cf6aa from signals

id sig_dd7b218cf6aa
event_id evt_37a3109f73d7
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_c9f140a44 ...
dedupe_key signal_enriched:news_delta:8ea739fcfb6246d0
throttle_s 0
created_at 2026-04-20T19:26:44.248604+00:00
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