Delete row sig_234d5e6e0872 from signals

id sig_234d5e6e0872
event_id evt_9b05629834c5
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T11:40:08.004425+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d032b728ef418394
throttle_s 0
created_at 2026-04-08T11:40:08.004425+00:00
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