Delete row sig_839bba3ec5d2 from signals

id sig_839bba3ec5d2
event_id evt_460c9479e348
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T23:47:59.325340+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0fccd1a9f24a0ed0
throttle_s 0
created_at 2026-04-09T23:47:59.325340+00:00
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