Delete row sig_108d42d48a37 from signals

id sig_108d42d48a37
event_id evt_9688bcdb22bd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T10:16:42.034536+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8d01a336e5bb9665
throttle_s 0
created_at 2026-04-22T10:16:42.034536+00:00
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