Delete row sig_dd885cb3506c from signals

id sig_dd885cb3506c
event_id evt_7410ddddbd46
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_5bd830426 ...
dedupe_key signal_enriched:news_delta:3d07b52814be70d1
throttle_s 0
created_at 2026-04-07T04:04:22.112297+00:00
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