Delete row sig_98ed3ba89d6c from signals

id sig_98ed3ba89d6c
event_id evt_a31e97eb4815
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T06:01:11.545502+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0f95d9137e8e85dd
throttle_s 0
created_at 2026-04-22T06:01:11.545502+00:00
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