Delete row sig_3b75d9951025 from signals

id sig_3b75d9951025
event_id evt_ecb506094e6e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T02:48:20.526960+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:72c60278a79d1c08
throttle_s 0
created_at 2026-04-21T02:48:20.526960+00:00
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