Delete row sig_b2ba58bc83b2 from signals

id sig_b2ba58bc83b2
event_id evt_8be6131a5575
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T00:07:04.267771+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:35f5c091f6e8cdfc
throttle_s 0
created_at 2026-04-08T00:07:04.267771+00:00
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