Delete row sig_df2c1b316b13 from signals

id sig_df2c1b316b13
event_id evt_cc57436bd525
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_d3d8ac120 ...
dedupe_key signal_enriched:news_delta:c516dd159693e099
throttle_s 0
created_at 2026-04-08T03:15:56.643489+00:00
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