Delete row sig_8326f7b08638 from signals

id sig_8326f7b08638
event_id evt_268bed4519e9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T15:55:05.414575+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6a998cc14bb05118
throttle_s 0
created_at 2026-04-17T15:55:05.414575+00:00
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