Delete row sig_df1ea516ac8f from signals

id sig_df1ea516ac8f
event_id evt_e36553a710bb
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_d6dc308e5 ...
dedupe_key signal_enriched:news_delta:5038ab86cc61657e
throttle_s 0
created_at 2026-04-09T16:31:19.554433+00:00
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