Delete row sig_9b2dd1b700ba from signals

id sig_9b2dd1b700ba
event_id evt_77a0ef2500d4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T14:31:46.218803+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:39b66fa4348c2853
throttle_s 0
created_at 2026-04-22T14:31:46.218803+00:00
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