Delete row sig_2167b6204e14 from signals

id sig_2167b6204e14
event_id evt_e158a5fee8bc
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T00:17:22.874267+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:80dcf5357e4bbaa2
throttle_s 0
created_at 2026-04-20T00:17:22.874267+00:00
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