Delete row sig_d244d58fc30b from signals

id sig_d244d58fc30b
event_id evt_649423ffde82
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T03:26:16.513341+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c968dd6d216a3e59
throttle_s 0
created_at 2026-04-19T03:26:16.513341+00:00
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