Delete row sig_4300071afa9a from signals

id sig_4300071afa9a
event_id evt_16d4d39d6b11
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T22:46:06.951369+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:78d02444d0937ed4
throttle_s 0
created_at 2026-04-17T22:46:06.951369+00:00
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