Delete row sig_df1a328d192c from signals

id sig_df1a328d192c
event_id evt_6e69c588aa8b
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_3f21ae17a ...
dedupe_key signal_enriched:news_delta:63cf0de11ecfb245
throttle_s 0
created_at 2026-04-17T05:58:32.931887+00:00
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