Delete row sig_51a37f9d98ae from signals

id sig_51a37f9d98ae
event_id evt_fe27c0889cd2
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T11:37:31.447508+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:054d3e853b909226
throttle_s 0
created_at 2026-04-12T11:37:31.447508+00:00
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