Delete row sig_58204e75630c from signals

id sig_58204e75630c
event_id evt_88d034f6f157
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T10:27:29.304602+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d604acbeeb34bf23
throttle_s 0
created_at 2026-04-14T10:27:29.304602+00:00
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