Delete row sig_dc22c8418902 from signals

id sig_dc22c8418902
event_id evt_167cde892ff6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T15:56:25.593941+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:36638fa7741c8e2c
throttle_s 0
created_at 2026-04-12T15:56:25.593941+00:00
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