Delete row sig_8ba63bce3487 from signals

id sig_8ba63bce3487
event_id evt_c5999ced287d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T05:23:28.158590+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:17190f78e1665434
throttle_s 0
created_at 2026-04-08T05:23:28.158590+00:00
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