Delete row sig_83d382eddaaa from signals

id sig_83d382eddaaa
event_id evt_b1341b5811c8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T08:31:18.757901+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f353706635b3ef50
throttle_s 0
created_at 2026-04-08T08:31:18.757901+00:00
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