Delete row sig_50444d9afc2b from signals

id sig_50444d9afc2b
event_id evt_3c179b0860e3
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T07:35:27.714094+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6b8eed42b65c3b5a
throttle_s 0
created_at 2026-04-18T07:35:27.714094+00:00
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