Delete row sig_df1d0829b90f from signals

id sig_df1d0829b90f
event_id evt_8afb0d6787c9
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_832402d0f ...
dedupe_key signal_enriched:news_delta:28203ecdea285c49
throttle_s 0
created_at 2026-04-17T01:27:21.596228+00:00
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