Delete row sig_b1baf65d15bf from signals

id sig_b1baf65d15bf
event_id evt_2d5c6131ea3a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T11:46:59.407763+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:634b20ff46e68736
throttle_s 0
created_at 2026-04-09T11:46:59.407763+00:00
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