Delete row sig_79b9d296c531 from signals

id sig_79b9d296c531
event_id evt_cb7b6fa284cd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T03:42:18.271078+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:501a5727c101bcce
throttle_s 0
created_at 2026-04-20T03:42:18.271078+00:00
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