Delete row sig_f328450ae0df from signals

id sig_f328450ae0df
event_id evt_5d51d0126367
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_2fab8ee31 ...
dedupe_key signal_enriched:news_delta:c8edbbd734465ca7
throttle_s 0
created_at 2026-04-10T21:57:54.734051+00:00
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