Delete row sig_22e9a4032e9d from signals

id sig_22e9a4032e9d
event_id evt_fa25f85da96c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T23:45:40.893520+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1170b794c51bd986
throttle_s 0
created_at 2026-04-07T23:45:40.893520+00:00
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