Delete row sig_50590fa6b39a from signals

id sig_50590fa6b39a
event_id evt_443f5b3bcfc4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T01:00:30.727756+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1c05ced00df306c0
throttle_s 0
created_at 2026-04-08T01:00:30.727756+00:00
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