Delete row sig_30d07c3af7dc from signals

id sig_30d07c3af7dc
event_id evt_342e53136d6f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T15:04:26.144127+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:05085fcf250da352
throttle_s 0
created_at 2026-04-20T15:04:26.144127+00:00
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