Delete row sig_5259b6e6962d from signals

id sig_5259b6e6962d
event_id evt_1b5c1403fa12
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T04:15:04.833270+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d862f171c911d7c4
throttle_s 0
created_at 2026-04-10T04:15:04.833270+00:00
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