Delete row sig_b750e4328a9f from signals

id sig_b750e4328a9f
event_id evt_a1095317f650
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T01:00:44.726095+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cc9e374a73d7a00f
throttle_s 0
created_at 2026-04-12T01:00:44.726095+00:00
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