Delete row sig_2cb393536165 from signals

id sig_2cb393536165
event_id evt_1e4bb28ced6d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T23:35:07.649768+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2690e61fc20d5766
throttle_s 0
created_at 2026-04-07T23:35:07.649768+00:00
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