Delete row sig_df3cf5367f24 from signals

id sig_df3cf5367f24
event_id evt_2df7ff385e38
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_d237de936 ...
dedupe_key signal_enriched:news_delta:7659d06bbc204805
throttle_s 0
created_at 2026-04-07T11:15:38.513824+00:00
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