Delete row sig_9ab2509e28bc from signals

id sig_9ab2509e28bc
event_id evt_70c84a7bde14
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T03:36:03.602283+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:63bc2c8b72e5b23f
throttle_s 0
created_at 2026-04-18T03:36:03.602283+00:00
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