Delete row sig_984fe58def87 from signals

id sig_984fe58def87
event_id evt_1014fe695bff
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-15T04:19:28.353794+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4502bfd422116865
throttle_s 0
created_at 2026-04-15T04:19:28.353794+00:00
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