Delete row sig_f290c8798c6a from signals

id sig_f290c8798c6a
event_id evt_1126f9257d21
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T07:54:33.772816+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b14ec3549d6ad14e
throttle_s 0
created_at 2026-04-19T07:54:33.772816+00:00
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