Delete row sig_58f96a7004bf from signals

id sig_58f96a7004bf
event_id evt_97c5b6c48c23
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T06:54:59.018346+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:54fbc0fc4457e948
throttle_s 0
created_at 2026-04-09T06:54:59.018346+00:00
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