Delete row sig_51c8929855de from signals

id sig_51c8929855de
event_id evt_10446685e9e7
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T07:15:50.721621+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3cde99677eff3cb1
throttle_s 0
created_at 2026-04-22T07:15:50.721621+00:00
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