Delete row sig_97df91573f1c from signals

id sig_97df91573f1c
event_id evt_8fe3ded54459
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T16:21:30.436537+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:00a2f0d8225ef1bb
throttle_s 0
created_at 2026-04-10T16:21:30.436537+00:00
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