Delete row sig_4019b571a442 from signals

id sig_4019b571a442
event_id evt_836e695f74b4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T18:35:14.874199+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bf4b61c332bf1879
throttle_s 0
created_at 2026-04-09T18:35:14.874199+00:00
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