Delete row sig_7ddcd9a5fb77 from signals

id sig_7ddcd9a5fb77
event_id evt_bcb129a01240
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_8b8202409 ...
dedupe_key signal_enriched:news_delta:8ca2f0f702f4b273
throttle_s 0
created_at 2026-04-21T16:42:29.632457+00:00
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