Delete row sig_97cede448887 from signals

id sig_97cede448887
event_id evt_3aa7e42d5ad5
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T04:34:45.126952+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fac23eb05271605f
throttle_s 0
created_at 2026-04-20T04:34:45.126952+00:00
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