Delete row sig_2a4d9a88db85 from signals

id sig_2a4d9a88db85
event_id evt_dd3d318b2059
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T08:32:27.492000+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b1849dfc86f0235b
throttle_s 0
created_at 2026-04-20T08:32:27.492000+00:00
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