Delete row sig_2da6e496e59f from signals

id sig_2da6e496e59f
event_id evt_ab4ec9445c76
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T13:17:09.268925+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:35f076f0afdd5565
throttle_s 0
created_at 2026-04-19T13:17:09.268925+00:00
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