Delete row sig_f2f0dcc9dff8 from signals

id sig_f2f0dcc9dff8
event_id evt_38c4f5a7cacd
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_e564f6c64 ...
dedupe_key signal_enriched:news_delta:981f2c439d007f1a
throttle_s 0
created_at 2026-04-17T14:05:37.019818+00:00
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