Delete row sig_dbdbdba599dc from signals

id sig_dbdbdba599dc
event_id evt_e0271e4fec7f
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_65f4be303 ...
dedupe_key signal_enriched:news_delta:9a520cf249e0b25a
throttle_s 0
created_at 2026-04-20T13:34:06.946191+00:00
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