Delete row sig_ff732eda1e69 from signals

id sig_ff732eda1e69
event_id evt_5bb7f2866459
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_a08912b4b ...
dedupe_key signal_enriched:news_delta:ef5151a1c10ea93b
throttle_s 0
created_at 2026-04-19T12:39:39.813049+00:00
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