Delete row sig_20b0034569ad from signals

id sig_20b0034569ad
event_id evt_1fb9b7aa56f9
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_9515d7b67 ...
dedupe_key signal_enriched:news_delta:1ebceeb7e7539711
throttle_s 0
created_at 2026-04-20T03:35:20.471839+00:00
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